Samurott
-Swords Dance
-Waterfall/Aqua Tail
-Aqua Jet/Slash
-X-scissor/Megahorn
Swords Dance boosts your attack. Waterfall and Aqua Tail are your main STABs. Waterfall has better accuracy and a flinch chance, but Aqua Tail has 10 more base damage. Aqua Jet gets priority, but Slash gets a high crits chance, and hits for mostly neutral damage. X-Scissor is good, but Megahorn adds 40 Base damage for 15 less accuracy. Either one is good.
Simisear
-crunch
-Acrobatics
-flame charge/Fire Punch (Egg Move)
-ankle sweep/Low Kick (Egg Move)
Acrobatics gets some coverage, and nice damage if you don't give it an item. Flame Charge is OK, but if you don't mind breeding, Fire Punch has 25 more damage and a burn chance. Ankle Sweep is also ok, but depending on the foe, Low Kick, another egg move, can be better.
Galvantula
-Thunderbolt
-Bug Buzz
-Energy ball
-Thunder Wave
Thunderbolt is better than Electra Net+Electro Ball IMO. The damage boost is nice, but it doesn't get that much better than Thunderbolt. Bug Buzz is another STAB. Thunder Wave slows down your opponent.
Garbodor
-Toxic
-Explosion
-Sludge Bomb
-Focus Blast
Gunk Shot's accuracy is terrible in my opinion. Not worth the extra damage. Explosion is a good suicide move incase something goes wrong. Focus Blast hits Steels that resist Explosion and are immune to poison.
Excadrill
-Earthquake
-Rock Slide
-Swords Dance
-aeril ace/Brick Break
Swords dance boosts your attack for harder hits. Rock Slide gets nice coverage with earthquake. Aerial Ace is a good coverage move, but Brick break also gets some coverage, and shatters Light Screen/Reflect too. It's your pick.
Beheeyem
-psychic
-Calm Mind
-recover
-thunder bolt
Calm Mind boosts are Sp.Atk for harder hits, and also your Sp.Def. Other than that, it's fine the way it is.