Hey, Hunk, I think I'll join, if that's ok.
Attempting to snag a Bold Suicune on Colosseum
Working on a Forretress for Battle Frontier.
Suicune rocks, most definitely. Bold nature is + Def, - Att, and since Water types have no physical weakness, and Suicune has 115 base Defence, it can take several physical hits. Bold nature works the best, since his weaknesses can be covered with a few Calm Minds. Here's the moveset I have in mind for him:
EV: 252 HP/176 Def/82 Sp Att
Combined with Spikes (this is why I'm training a Forretress), this can be a complete beast to take down.