Dragalge @ Leftovers
EVs: 252 HP / 128 Def / 128 Atk or 252 HP / 252 Atk / 4 Def
- Sludge Bomb
- Dragon Pulse / Draco Meteor
- Secret Power
My first post here and haven't tried the above yet but it should work. First, Leftovers is to replace Black Sludge so it can work with Camouflage. It isn't going to be moving fast enough to be considered useful in Speed EVs so no need to waste time with it (plus by lowering Speed with its Quiet Nature, Dragalge can work well with Trick Room teams), and the lost EVs can go to upping its better Special Attack.
Sludge Bomb and Dragon Pulse are STAB with Adaptability, and are still good moves to use without the STAB. If you feel like gambling with the lost Special Attack and slightly less accuracy however, Draco Meteor is much more powerful and a great replacement (especially if Nasty Plotted/Baton Passed).
Adaptability works great with Camouflage and Secret Power because Camouflage changes Dragalge's type to match the terrain/field which also gives it a wider defense range, then Secret Power changes its power type to match the terrain/field it can work with, and finally Adaptability powers it up to give it a powerful STAB and more of a variety of a battle style.
Split EVs for Attack and Defense are for a powered up Secret Power (if it gets boosted physically, if not focus only on Defense and maybe 4 to Special Attack) and added bulk respectively. Just something else to work with considering it is the 'mock kelp' Pokemon and I wanted to present a 'fun' move-set haha.
Again, this is my first post so any problems I apologize as I am still learning. :]