Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Its a Tentacool, - I'm not sure how CP's work, you do encounter them wild on 4th Gen. It would be a Scarf set. Toxic Spikes, Ice Beam, Hydro Pump, Sludge Bomb So Timid. But if you can do Roaming Legendaries, then a TR Latias 31/x/31/31/31/0
I saw your GA thread, - and if thats completed was wandering if you wanted a CP/BP to keep you entertained, I noticed if RNG'ers like them, they generally do it for self-gain and offer the suggester a copy. You might like the one I have in mind. But only if you have enough time,