I'm interested in the HP Ice Thundurus - I'll clone and send you one back.
Unfortunately, I don't have SR legendaries of my own to offer, but I would be able to get you the following 5IVs:
Amoonguss: Sassy Regenerator 31/x/31/31/31/0
Bagon: Naughty/Rash Rock Head 31/31/x/31/31/31 or 31/31/31/31/x/31
Beldum: Adamant Clear Body 31/x/31/31/31/31
Cottonnee: Calm/Timid Prankster 31/x/31/31/31/31
Drilbur: Jolly Mold Breaker 31/31/31/x/31/31
Electrike: Modest Lightningrod 31/x/31/31/31/31
Gastly: Timid Levitate 31/x/31/31/31/31
Goomy: Calm/Modest Gooey 31/x/31/31/31/31
Growlithe: Calm Intimidate 31/x/31/31/31/31
Honedge: Quiet No Guard 31/x/31/31/31/0
Lotad: Modest Swift Swim 31/x/31/31/31/31
Mareep: Modest Static 31/x/31/31/31/31
Mawile: Adamant Intimidate 31/x/31/31/31/31
Pachirisu: Modest Pickup 31/x/31/31/31/31
Pinsir: Jolly Hyper Cutter 31/31/31/x/31/31
Ralts: Calm Telepathy/Trace 31/x/31/31/31/31
Slakoth: Adamant Truant 31/x/31/31/31/31
Squirtle: Modest Torrent 31/x/31/31/31/31
Swinub: Jolly/Adamant Thick Fat 31/31/31/x/31/31
Tentacool: Timid Liquid Ooze 31/x/31/31/31/31
Timburr: Brave Guts 31/31/31/x/31/0
Togepi: Calm Serene Grace 31/x/31/31/31/31
I was dumb and didn't write down the egg moves, but feel free to ask.
I'd be more than willing to send you like... 3 or 4 of these (might even sweeten the deal with a Master Ball or two ;D) for the Thundurus.