dont think it needs any,but you're welcomed to.Sure. Is that for the 3? (I do need the ditto)
So the Marill and Horsea (any egg moves on Horsea?) for:
RhyhornRock Head
Adamant
31.31.31.x.31.31
Fire Fang, Ice Fang, Thunder Fang, Metal Burst
HorseaSwift Swim
Modest
31.e.31.30.31.31 HP Grass
Outrage
LarvitarGuts (prefer friend ball if you have a jolly one)
Jolly
31.31.31.x.31.31
Stealth Rocks, Dragon Dance, Outrage, Pursuit
and that's good
Im sure if its fair,but the Suicune seems awesome,feel free to find something extra if you want.Solid Soft Resets you have there! CMT for that luxurious Latias