Whoop dee doo!
This is a good team. Counters everything on your team.
All I suggest is your suicune to be sleep talker. With calm mind and surf.
Reason why? Most team oppenents pack a pokemon that induces sleep moves.
Otherwise your team is very good. This is a good team to counter scizors and other sweepers..
Hi and welcome to Smogon,
your team is quite solid, just a few notes:
1) Since Rotom is your best counter for Gyarados, I'd advise to give it a bold nature and an EV spread of: 252 HP / 168 Def / 88 Spe, dropping charge beam for thunderbolt and substitute for either hidden power [ground], to punish Heatran's switch ins, or rest. With the suggested Spe EVs you'll be faster than every Scizor, but since you also run Magnezone, then you might also run max Def.
2) On Salamence definitely switch to a naive nature and use the standard EV spread of: 232 Atk / 24 SpA / 252 Spe, dropping either dragon claw or outrage for fire blast. Since Skarmory usually runs shed shell just to escape from Magnezone, having a reliable way to ohko it may be a good idea. Also, I'd probably prefer to keep dragon claw over outrage: being free to switch out means that when your opponent sends in Scizor to revenge kill Salamence you can switch in Magnezone on the bullet punch and eliminate it with hp fire.
3) If you decide to run the standard sleep talk Suicune, then switch to a bold nature and run max HP and Def, as cro-Cune needs all the defence it can get to take hits from powerful attackers like TTar and Infernape.
Good luck with your team!
Everything after this initial paragraph is going to be made up in an attempt to disguise the fact that, at the end of it all, my rating is entirely going to be determined by the title.
Ice Beam > Ice Punch on Swampert no EVs in attack. The damage difference is very slim, about 2%, but it is the better choice.
I love Charge Beam, but I agree with above on going with a Tbolt instead. Though, in the case of Gyarados you might be able to ohko it even with Charge Beam. (I know Jolteon can do it, but I think I tested with a DD rather than Bulky, unsure if that could make a difference.) Up to you though.
I can't think of too much else to say, your team looks fairly solid and I'm not the best rater/builder around. So I don't wanna say too much.
Your Suiciune EVs add up to 408, not 508.
A cool Maggy Spread is 56 Atk / 252 SpAtk / 200 Spe
Rash
It allows for 2HKO of Vappy and outruns JollyCario.