Pokemon platinum team help

[JJJKraan123]

I am currently building a team with (mostly) OU pokemon:


Azumarill@Choice Band
Adamant nature, 240 HP, 252 Atk, 16 Speed
~ Aqua Jet
~ Waterfall
~ Double Edge
~ Superpower


Flygon@Life Orb
Jolly nature, 32 HP, 252 Atk, 8 Def, 216 Speed
~ Earthquake
~ Roost
~ Fire Blast
~ Dragon Claw


Rotom-Heat@Choice Specs
Timid nature, 4 HP, 252 Spatk, 252 Speed
~ Thunderbolt
~ Overheat
~ Shadow Ball
~ Trick

I also want to add a timid shaymin or a modest jirachi(with draco meteor), but I don't know what moves I should give it. I also need a physical or/and a special wall
Please help!