Rate my Pokemon Diamond Team?

This isn't an insult, but trust me: Late game Roselia sucks. She's too weak to really win anything except pure grass weakness.

Drapion having Toxic Spikes kinda confuses me. It looks like a general 'beat-em-up' pokemon, but it has that. I recommend replacing Toxic Spikes with plain Toxic.

Everyone else has provided good answers for your pokemon but I have a suggestion for Gallade. Firstly Gallade usually is a better attacker so you should only use physical moves. The best moves would be- Psycho Cut, Close Combat, Stone Edge, Night Slash. Psycho Cut is physical so it's better for Gallade than Psychic. Close Combat is more powerful than Brick Break. Gallade has only two weaknesses, flying and ghost, so Stone Edge and Night Slash will take care of that and they are pretty good moves. (Originally it was suggested that Gallade have a grass move and if you want one you should teach it leaf blade with a heart scale)

The fist plate is only good with infernape if it knows a fighting type move and the team is pretty good. heres my team.

LVL 100 mewtwo

LVL 100 giratina

LVL 100 blastiose

LVL 100 Lugia

LVL 100 salamence

LVL 100 Charizard

And i didnt even cheat! I just have almost 500 hours on there lol.

you really need a water type. water types are very important

heres my team

jolteon

arcanine

empoleon

torterra

lucario

dragonite

i would love to battle

tammy

friend code: 3995 3071 5025

nice team just lvl em up so there stats grow.

then they are strong...remeber going to the daycare means they lvl but the stats don't.

nice team curse 2492 0596 6546

i can woop them but if you want them to be lv 100, i can get them to 100 and wooping moves that they shouldent learn