Well i'm playing pixelmon 1.7.10
And i'm trying a normal gym
1st porygon2, abilty download moves; recover, tri attack, psychic and thunder wave lv 25
2nd starapotor, dont know ability
Moves; close combat, brave bird (dont know other two)
3th miltank, ability thick fat, moves; toxic, milk drink, thunder wave and (dont know) pls help me he keeps using recover and milkdrink
What Trachy mentioned in the comments about using a Ghost-type Pokémon to battle your Normal-type Gym Leader is pretty good advice, because Ghost is immune to Normal (but, Normal also is immune to Ghost). So, try using a Fighting-type move (if your Ghost-types can learn them either through TM, egg move, level-up, or even Hidden Power), because Normal-type's only weakness is Fighting. And that's all I have to say about that.
You need a Pokemon with the move taunt to stop them from recovering and toxicing and thunder waving.