Here is the updated one that you can try filling that up.
721 Pokemon where you have all:
1. 20 vivillon sprites --(same concept with unown)
2. rotom form sprites (6 forms)*
3. shellos and evolve (2 colors)*
4. jellicent and pre evole(2 colors)*
5. burmy and evolve (3 colors)*
6. basculin (2 colors) --(same concept with unown)
7. girantina 2 forms*
8. shaymin 2 forms*
9. arceus 18 forms*
10. darmatan (2 modes)* optional
11. deerling and evolve (4 forms)
12. Tornadus, Thundurus, and Landorus (2 form each)
13. kyurem (3 forms)*
14. keldeo 2 forms*
15. meloetta (2 forms)*
16. genesect 5 forms *
17. Flab?b?, Floette, and Florges (5 colors) + AZ's unique Floette
18. Furfrou (10 haircuts)*optional
19. Aegislash (atk and def form)*
20. Pumpkaboo and Gourgeist (4 sizes)*optional
21. xerneas (2 forms)* --70
22. Hoopa (2 forms)*
*could be added on pokedex #722 onwards
48 mega evolution
Non-standard alternate coloration - anime
1. pink butterfree
2. green weedle
3. Valencian pokemon - (Butterfree, Raticate, Nidoran?, Nidoran?, Vileplume, Paras, and Weepinbell.) --7
4. crystal onix
5. pink pokemon (Caterpie, Weedle, Pidgey, Rattata, Pikachu, Nidoran?, Nidoran?, Nidoking, Vileplume, Paras, Parasect, Venonat, Diglett, Mankey, Primeape, Bellsprout, Dodrio, Exeggutor, Rhyhorn and Rhydon.
Pidgeotto, Oddish, Poliwhirl, Geodude, Scyther and Electabuzz.) --26
6. Ash's Lapras's mother ?
7. Snowmen Snorlax
8. Purple Kecleon
9. Deoxys with a green crystal
10. light-blue Marill, a blue Breloom and a Shroomish with white spots --3
11. golden sudowoodo
12. Porygon Zero
13. Puka
14. Gengar god
15. Alakazam god
16. giant Jigglypuff god
17. Lapras leader
18. Wooper with a heart-shaped
19. red and blue tailed smeargle --2
20. heart shaped spinda
21. May's Bulbasaur
22. Merrick, Bort, Allotrope, and Dace
23. cloned pokemon by mewtwo (Squirtletwo, Bulbasaurtwo, and Charmandertwo, Venusaurtwo, Charizardtwo, Blastoisetwo, Pikachutwo ) --7
i found these in bulbapedia