I dont Like speed pokemon.
I Do play with flagship pokemon or wallpokemon.
Tank sturdy poison selfheal.
If that is Not given i dont know.
Maybe try another Team.
For sure IT Takes a Lot of time but you will learn much more About the pokemmo pokemon e4 and the mechanics.
I dont know how Hard they boosted but,
Pokemon IV only impotent Here.
I think pokemon EV only important when a pokemon reach Level 100.
IV give your pokemon stat Bonus whiLe Level IT.
Then you have just the pokemon stats
And then there is the pokemons Ev value which gives a Bonus AT Level 100 like:
+1 Bonus stats for each 4 Ev Points on a stat
Like:
-atk 200 Standarte
Atk ev 40 = + 10 (AT Level 100)
Which is atk stat is Like 210 AT pokemon Level 100 then.
I dont know how ist scripted in this game but thats how i know its working usually for pokemon.