This story will be crossover between Pokemon and Familiar of Zero. Y/N will be Pokemon that was summonned by Louise. And yes, he can transform into human.
Special thanks goes to AkiraTigerMask for giving me an idea for this story with his (now deleted) crossover between Kamen Rider Wizard and Familiar of Zero.
1) Beedrill
2) Sandslash
3) Rhydon
4) Steelix
5) Sharpedo
6) Camerupt
7) Seviper
8) Armaldo
9) Tropius
10) Kyogre
11) Groudon
12) Bastiodon
13) Garchomp
14) Carnivine
15) Krookodile
16) Cofagrigus
17) Galvantula
18) Cryogonal
19) Kyurem
20) Malamar