Because the omnitrix has over 1,000,903 DNA store in it. The omnitrix might have bakugan,Dragonball Z, and pokemon.
1. Heatblast
2. Wildmutt
3. Diamondhead
4. XLR8
5. Fourarms
6. Ripjaws
7. Stinkfly
8. Ghostfreak
9. Grey Matter
10. Upgrade
11. Cannonbolt
12. Wildvine
13. Benwolf
14. Benmummy
15. Benvicktor
16. Upchuck
17. Ditto
18. Way Big
19. Eye Guy
20. Articguana
21. Spitter
22. Buzz Shock
23. Putty
24. Overkill
25. Mindmesser
26. Earthshaker
27. Sandbox
28. Atomix
29. Toepick
30. Snakepit
31. Shellhead
32. Frostbite
33. Blocker
34. Razr Edge
35. Common Cold
36. Overflow
37. Rockhard
38. Bendactyl
39. Muscleman
40. Teleportal
41. Darkflame
42. Nightmare
43. Crypto
44. Angelhands
45. Drillbit
46. Spykeback
47. Rubix-Dude
48. Eon
49. Joker
50. Creeper
51. Chromastone
52. Jetray
53. Spidermonkey
54. Swampfire
55. Goop
56. Brainstorm
57. Humongousaur
58. Echo Echo
59. Big Chill
60. Alien X
61.Loadstar
62.Nanomech
63.Wrath
64.Alpha Hydranoid
65.Apollonir
66.Bee Striker
67.Blade Tigrerra
68.Centipoid
69.Clayf
70.Cycloid
71.Delta Dragonoid
72.Dragonoid
73.Dual Hydranoid
74.El Condor
75.Exedra
76.Falconeer
77.Fear Ripper
78.Fortress
79.Frosch
80.Gargonoid
81.Gorem
82.Griffon
83.Hammer Gorem
84.Harpus
85.Hydranoid
86.Hynoid
87.Infinity Dragonoid
88.Juggernoid
89.Lars Lion
90.Laserman
91.Limulus
92.Manion
93.Mantris
94.Monarus
95.Naga
96.Oberus
97.Preyas
98.Preyas
99.Rattleoid
100.Ravenoid
101.Reaper
102.Robotallion
103.Saurus
104.Serpenoid
105.Siege
106.Skyress
107.Stinglash
108.Storm Skyress
109.Tigrerra
110.Tuskor
111.Ultimate Dragonoid
112.Tentaclear
113.Terrorclaw
114.Sirenoid
115.Warius
116.Wavern
117.Wormquake
118.Abis Omega
119.Altair
120.Alpha Hydranoid
121.Alpha Percival
122.Alto Brontes
123.Atchibee
124.Anchorsaur
125.Atmos
126.Dice Thrower
127.Boost Ingram
128.Brontes
129.Clawcer
130.Cosmic Ingram
131.Dual Elfin
132.Elico
133.Elfin
134.Fencer
135.Freezer
136.Fly Beetle
137.Foxbat
138.Goblinball
139.Hades
140.Hammersaur
141.Cyborg Helios
142.Hyper Dragonoid
143.Ingram
144.Jelldon
145.Klawgor
146.Leefram
147.Maxus Drago
148.Maxus Helios
149.Mega Brontes
150.Mega Nemus
151.Midnight Percival
152.Moskeeto
153.Myriad Hades
154.Neo Dragonoid
155.Nemus
156.Percival
157.Primo Vulcan
158.Pyro Dragonoid
159.Rafflesian
160.Scraper
161.Shadow Vulcan
162.Spindle
163.Spin Dragonoid
164.Spin Ravenoid
165.Stug
166.Thunder Wilda
167.Ultra Dragonoid
168.Vandarus
169.Verias
170.Viper Helios
171.Wilda
172.Wired
173.Wontu
174.Baliton
175.Brachium
176.Carlsnaut
177.Dark Hound
178.Dartaak
179.Dynamo
181.Falcon Fly
182.Fire Scorpion
183.Flash Falcon Fly
184.Fortress Trap
185.Grafias
186.Grakas Hound
187.Hexados
188.Hexstar
189.Hylash
190.Legionoid
191.Metalfencer
192.Piercian
193.Pythantus
194.Scorpion
195.Spitarm
196.Spyderfencer
197.Triad El Condor
198.Triad Sphinx
199.Tripod Theta
200.Tripod Epsilon
201.Zeon Hylash
202.Zoack
203.Charmander
204.Charmeleon
205.Charizard
206.Squirtle
207.Wartortle
208.Blastoise
209.Caterpie
210.Metapod
211.Butterfree
212.Pidgey
213.Pidgeotto
214.Pidgeot
215.Rattata
216.Raticate
217.Spearow
218.Fearow
219.Pikachu
220.Raichu
221.Sandshrew
222.Sandslash
223.Clefairy
224.Clefable
225.Vulpix
226.Ninetales
227.Jigglypuff
228.Wigglytuff
229.Diglett
230.Dugtrio
231.Meowth
232.Persian
233.Psyduck
234.Golduck
235.Mankey
236.Primeape
237.Growlithe
238.Arcanine
239.Poliwag
240.Poliwhirl
241.Poliwrath
242.Abra
243.Kadabra
244.Alakazam
245.Machop
246.Machoke
247.Machamp
248.Geodude
249.Graveler
250.Golem
251.Ponyta
252.Rapidash
253.Slowpoke
254.Slowbro
255.Magnemite
256.Magneton
257.Farfetch'd
258.Doduo
259.Dodrio
260.Seel
261.Dewgong
262.Onix
263.Drowzee
264.Hypno
265.Krabby
266.Kingler
267.Voltorb
268.Electrode
269.Exeggcute
270.Exeggutor
271.Cubone
272.Marowak
273.Hitmonlee
274.Hitmonchan
275.Lickitung
276.Koffing
277.Weezing
278.Rhyhorn
279.Rhydon
280.Chansey
281.Tangela
282.Kangaskhan
283.Horsea
284.Seadra
285.Goldeen
286.Seaking
287.Staryu
288.Starmie
289.Mr. Mime
290.Scyther
291.Jynx
292.Electabuzz
293.Magmar
294.Pinsir
295.Tauros
296.Magikarp
297.Gyarados
298.Lapras
299.Ditto
300.Eevee
301.Vaporeon
302.Jolteon
303.Flareon
304.Porygon
305.Omanyte
306.Omastar
307.Kabuto
308.Kabutops
309.Aerodactyl
310.Snorlax
311.Articuno
312.Zapdos
313.Moltres
314.Dratini
315.Dragonair
316.Dragonite
317.Mewtwo
318.Mew
319.Chikorita
320.Bayleef
321.Meganium
322.Cyndaquil
323.Quilava
324.Typhlosion
325.Totodile
326.Croconaw
327.Feraligatr
328.Sentret
329.Furret
330.Hoothoot
331.Noctowl
332.Ledyba
333.Ledian
334.Pichu
335.Cleffa
336.Igglybuff
337.Togepi
338.Togetic
339.Natu
341.Xatu
342.Mareep
343.Flaaffy
344.Ampharos
345.Bellossom
346.Marill
347.Azumarill
348.Sudowoodo
349.Politoed
350.Hoppip
351.Skiploom
352.Jumpluff
353.Aipom
354.Sunkern
355.Sunflora
356.Yanma
357.Wooper
358.Quagsire
359.Espeon
360.Umbreon
361.Murkrow
362.Slowking
363.Misdreavus
364.Unown
365.Wobbuffet
367.Girafarig
368.Pineco
369.Forretress
370.Steel
371.Dunsparce
372.Gligar
373.Steelix
374.Snubbull
375.Granbull
376.Scizor
377.Shuckle
378.Heracross
379.Sneasel
380.Teddiursa
381.Ursaring
382.Slugma
383.Magcargo
384.Swinub
385.Piloswine
386.Corsola
387.Remoraid
388.Octillery
389.Delibird
390.Mantine
391.Skarmory
392.Houndour
393.Houndoom
394.Kingdra
395.Phanpy
396.Donphan
397.Porygon2
398.Stantler
399.Smeargle
400.Tyrogue
401.Hitmontop
402.Smoochum
403.Elekid
404.Magby
405.Miltank
406.Blissey
407.Raikou
408.Entei
409.Suicune
410.Larvitar
411.Pupitar
412.Tyranitar
413.Lugia
414.Ho-oh
415.Celebi
416.Treecko
417.Grovyle
418.Sceptile
419.Torchic
420.Combusken
421.Blaziken
422.Mudkip
423.Marshtomp
424.Swampert
425.Poochyena
426.Mightyena
427.Zigzagoon
428.Linoone
429.Wurmple
430.Silcoon
431.Beautifly
432.Lotad
433.Lombre
434.Ludicolo
435.Seedot
436.Nuzleaf
437.Shiftry
438.Taillow
439.Swellow
440.Wingull
441.Pelipper
442.Ralts
443.Kirlia
445.Gardevoir
446.Surskit
447.Masquerain
448.Shroomish
449.Breloom
450.Slakoth
451.Vigoroth
452.Slaking
453.Nincada
454.Ninjask
455.Shedinja
456.Whismur
457.Loudred
458.Exploud
459.Makuhita
460.Hariyama
461.Azurill
462.Nosepass
463.Skitty
464.Delcatty
465.Sableye
466.Mawile
467.Aron
468.Lairon
469.Aggron
471.Meditite
472.Medicham
473.Electrike
474.Manectric
475.Plusle
476.Minun
477.Volbeat
478.Illumise
479.Carvanha
480.Sharpedo
481.Wailmer
482.Wailord
483.Numel
484.Camerupt
485.Torkoal
486.Spoink
487.Grumpig
488.Spinda
489.Trapinch
490.Vibrava
491.Flygon
492.Cacnea
493.Cacturne
494.Swablu
495.Altaria
496.Zangoose
497.Seviper
498.Lunatone
499.Solrock
500.Barboach
501.Whiscash
502.Corphish
503.Crawdaunt
504.Baltoy
505.Claydol
506.Lileep
507.Cradily
508.Anorith
509.Armaldo
510.Feebas
511.Milotic
512.Castform
513.Kecleon
514.Shuppet
515.Banette
516.Duskull
517.Dusclops
518.Tropius
519.Chimecho
520.Absol
521.Wynaut
522.Snorunt
523.Glalie
524.Spheal
525.Sealeo
526.Walrein
527.Clamperl
528.Huntail
529.Gorebyss
530.Relicanth
531.Luvdisc
532.Bagon
533.Shelgon
534.Salamence
535.Beldum
536.Metang
537.Metagross
538.Regirock
539.Regice
540.Registeel
541.Latias
542.Latios
543.Kyogre
544.Groudon
545.Rayquaza
546.Jirachi
547.Deoxys
548.Turtwig
549.Grotle
550.Torterra
551.Chimchar
552.Monferno
553.Infernape
554.Piplup
555.Prinplup
556.Empoleon
557.Starly
558.Staravia
559.Staraptor
560.Bidoof
561.Bibarel
562.Kricketot
563.Kricketune
564.Shinx
565.Luxio
566.Luxray
567.Cranidos
568.Rampardos
569.Shieldon
570.Bastiodon
571.Burmy
572.Wormadam
573.Mothim
574.Combee
575.Vespiquen
576.Pachirisu
577.Buizel
578.Floatzel
579.Cherubi
580.Cherrim
581.Shellos
582.Gastrodon
583.Ambipom
584.Drifloon
585.Drifblim
586.Buneary
587.Lopunny
589.Mismagius
590.Honchkrow
591.Glameow
592.Purugly
593.Chingling
594.Bronzor
595.Bronzong
596.Bonsly
597.Mime Jr.
598.Happiny
599.Chatot
601.Spiritomb
602.Gible
603.Gabite
604.Garchomp
605.Munchlax
606.Riolu
607.Lucario
608.Hippopotas
609.Hippowdon
610.Finneon
611.Lumineon
612.Mantyke
613.Snover
614.Abomasnow
615.Weavile
616.Magnezone
617.Lickilicky
618.Rhyperior
619.Tangrowth
620.Electivire
621.Magmortar
622.Togekiss
623.Yanmega
624.Leafeon
625.Glaceon
626.Gliscor
627.Mamoswine
628.Porygon-Z
629.Gallade
630.Probopass
631.Dusknoir
632.Froslass
633.Rotom
634.Uxie
635.Mesprit
636.Azelf
637.Dialga(seen only in ben 10,000)
638.Palkia (seen only in ben 10,000)
639.Heatran
640.Regigigas
641.Giratina (seen only in ben 10,000)
642.Cresselia
643.Phione
644.Manaphy
645.Darkrai
646.Shaymin
647.Arceus
648.Genie
649.Saiyan
650.Kanassan
651.Kashvars
652.Majins
653.Makyans
654.Namekians
655.Ogre
656.Oni
657.Tuffle
658.Anodite
659.ice guy
660.dark fire
661.starfighter
662.Highwire
663.Roadtrip
664.Gamma Blast
665.Livewire
666.Meteor Mind
667.Stardust Dragon