[Question] Mega Pokemon doesn't show shadow nor alt. works?

Hey everyone I have a tiny issue, it's not the most important thing, but I have a mega Evolution that I am trying to insert into the game, and whenever I try to modify the altitude, BattlerEnemyY, etc, it doesn't change. Any ideas?

[SNAILECTRIC-1]
FormName=Mega Snailetric
BaseStats=72,10,80,100,120,100
Abilities=SURGESURFER
BattlerPlayerY=0
BattlerEnemyY=2
BattlerAltitude=10
MegaStone=SNAILECTRITE

that's what I have, and any help would be greatly appreciated :)
(I should pinpoint that it is indeed on the Pokemonforms.txt)