"Help me destroy my younger brother"

So, I’m the oldest of the house and I guess my knowledge of Pokémon is prehistoric by now. I got into Pokémon omega ruby with my little brother and he completely obliterates me. I was hoping to recieve advice for perfect counters against (dialga, kyogre, raquaza, drudigen, groudon, swampert). Needless to say, my gengar just wasn’t enough. via /r/pokemon https://ift.tt/2Fv0U0o