A lovely little moveset for maximum type coverage. Actually, there are 592 Pokemon that this guy can hit super-effectively against, he only has two weaknesses himself and he has fair speed and good bulk meaning he's a very versatile player. Anyway, my type-advantage Feraligatr.
Feraligatr@Expert Belt/Life Orb
Ability: Sheer Force
Brick Break/Dragon Dance
Explanation: Basically, this guy hits every type (based on the moves on the left) apart from Water, Fighting, Bug and Fairy (and a few dual types resist him, such as Charizard and Malamar), but every single other Pokemon (including those dual-types) is hit for neutral damage. Expert Belt takes advantage of this, it boosts the power of super-effective moves by 20%, which is basically giving Feraligatr a Life Orb with no recoil. That brings us to the Life Orb, thanks to Sheer Force Feraligatr gets no recoil on Sheer Force boosted moves (Ice Punch/Fang, Crunch and Bulldoze), which brings us to his moves. Shadow Claw gives you coverage against about 12 more Pokemon, but doesn't abuse the Sheer Force/Life Orb combo, whereas Crunch does. Ice Punch is more accurate, but Ice Fang has more Power (both abuse the SF/LO combo). Brick Break is coverage and gets rid of Reflect from Klefki etc. but isn't affected by Sheer Force. Earthquake has higher base power, but isn't boosted by Sheer Force so it will have recoil, whereas SF boosts Bulldozes power to 90 which is 10 less, but the LO won't give you any recoil. Your choice on the moves. This moveset makes him a lethal opponent. If you want, you can swap Brick Break for Dragon Dance and use his bulk to set up, but this will reduce the number of opponents you can super-effectively hit by just over 100 so is not recommended. Sheer Force allows you to swap some of his attack EV's for defense and utilise his respectable defence. Adamant makes him more of a powerhouse, whereas Jolly lets him have a respectable 143 Speed (at lv. 50 with 31 IV's), which is enough to outspeed a large amount of commonly used Pokemon whilst still having nice bulk. Hope this set is useful :)