This guy is a pretty decent tank!
Ability: Snow Cloak
Avalanche- You need to use Beartic's awful speed to really devastate your opponent and that is what Avalanche does(STAB.).
Substitute- Leftovers and speed abuse.
Focus Punch- This guy can pull off a flawless Focus Punch. Another truly devastating tactic.
Aqua Jet- For the ever-so-common fire and rock types.
Being slow is this guy's secret weapon so give him a Sassy nature. For the EVs, give him 252 Def/128 Spd(Special Defense because I just realized it looks like Speed.)/128 Atk.