Advice for my pokemon diamond party?

Question

Here's my party

Dialga lvl. 56

Infernape lvl. 52

Garchomp lvl. 49

Toxicroak lvl. 49

the rest of my pokemon suck.

Answer 1

if you have any of the games (leafgreen,firered,ruby,sapphire,emerald... migrate them. otherwise, find a starly with a brave nature and level it up to staraptor. since the nature the attack goes up 3-5 points every level up. also luxray with an adamant nature.