I can give you any catchable legendary for a squirtle/bulbasaur and then add a grass knot tm for the other.
Edit- Oh yeah, friend code for platinum is 2321 2057 6848 since I'm going to put them on there first to breed them then switch them to soul silver to play through the game with.
Is an Arceus in the mix for that? I'll give you a Squirtle and a Bulbasaur for an Arceus. If not I'll take whatever with Grass Knot attached for one of those two.
EDIT: Friend code for Diamond is 3823 5208 1795, trainer name is Iris.