I'll do some aesthetic critiques as well.
Should Poison Jab be included in movesets? I don't feel like it's all that flavorful (most Pokemon that learn it have appendages to use it with; the Tentacool family is the sole one to learn it and have tentacles (which are far longer than Mollux's to begin with)... The only thing I can imagine is an attack like the Spiked Goombas in Paper Mario, lol).
nyttyn: I agree with bmb to an extent, but I'd suggest switching Heat Wave with Eruption instead. Move Stealth Rock to egg moves; since it's in field, there are no incompatibilities (breed with Smeargle). Every Pokemon that learns the move by levelup is related in some way to Rock-types; Mollux is not.
Malkyrian: I really like the color of your movepool, but I can't say much else.
AOPSUser: Get rid of Will-o-wisp (it is learned through levelup by Ghost-types and Vulpix (which has a strong tie to the paranormal through flavor)), move Fire Blast up quite a few levels (imagine Fire Blast at level 15!), Calm Mind really should just be a TM (but this is a lesser qualm), move either Gunk Shot or Octazooka up a few levels (when moves are learned at the same level, they tend to be something along the lines of Stockpile/Spit Up /Swallow or the powders all at the same time; those two moves are unrelated), and move Overheat far down - nothing learns a move at level 100 (bar various legendary Pokemon) and there's a huge gap in levelup moves between it and Sludge Wave.
LouisCyphre: I have nothing to say; this looks fine.
capefeather: God, you must really hate Mollux; nothing but Bide until level 20? Spare its poor little ingame life and give it something special (Ember, Incinerate, Fire Spin, Smog... anything!). Brick Break seems off flavor-wise (all of its learners have arms or have pre-evolutions / evolutions with arms). You may want to stick a few flavor moves in egg moves; it's a bit quiet there with only 4 moves.
ZhengTann: Leech Life doesn't fit here (it's a blood draining attack.. and Mollux has no fangs), level 50 should be "Wring Out".
The Reptile: Heart Scale moves don't work that way; afaik, when you encounter a Pokemon, its moves are the last four level-up moves it could have learned. In other words, level one Mollux will have Stockpile, Soak, Ember, and Wrap. I'm not sure if this is what you want. Learning Constrict at level 20 (a move that is generally both a base move and learned before wrap) is cruel.
Korski: Dragon Tail doesn't seem to flavorful, considering Mollux does not have a tail or an evolution / pre-evolution with one. Otherwise, the rest is good.
Banryu: I'm ok with everything you've got.
Nyktos: Leech Life is, again, a move that requires fangs; it doesn't fit Mollux too well. Synthesis, as you noted, seems odd; it really doesn't fit too well flavor-wise either. I'd suggest just tossing it and sticking either of its clones in level-up instead.
MCBarrett: I have no qualms here.
Forestflamerunner: Nothing learns explosion at that low of a level bar the regi trio; move it up.
Mari: No problems here.
Should Poison Jab be included in movesets? I don't feel like it's all that flavorful (most Pokemon that learn it have appendages to use it with; the Tentacool family is the sole one to learn it and have tentacles (which are far longer than Mollux's to begin with)... The only thing I can imagine is an attack like the Spiked Goombas in Paper Mario, lol).
nyttyn: I agree with bmb to an extent, but I'd suggest switching Heat Wave with Eruption instead. Move Stealth Rock to egg moves; since it's in field, there are no incompatibilities (breed with Smeargle). Every Pokemon that learns the move by levelup is related in some way to Rock-types; Mollux is not.
Malkyrian: I really like the color of your movepool, but I can't say much else.
AOPSUser: Get rid of Will-o-wisp (it is learned through levelup by Ghost-types and Vulpix (which has a strong tie to the paranormal through flavor)), move Fire Blast up quite a few levels (imagine Fire Blast at level 15!), Calm Mind really should just be a TM (but this is a lesser qualm), move either Gunk Shot or Octazooka up a few levels (when moves are learned at the same level, they tend to be something along the lines of Stockpile/Spit Up /Swallow or the powders all at the same time; those two moves are unrelated), and move Overheat far down - nothing learns a move at level 100 (bar various legendary Pokemon) and there's a huge gap in levelup moves between it and Sludge Wave.
LouisCyphre: I have nothing to say; this looks fine.
capefeather: God, you must really hate Mollux; nothing but Bide until level 20? Spare its poor little ingame life and give it something special (Ember, Incinerate, Fire Spin, Smog... anything!). Brick Break seems off flavor-wise (all of its learners have arms or have pre-evolutions / evolutions with arms). You may want to stick a few flavor moves in egg moves; it's a bit quiet there with only 4 moves.
ZhengTann: Leech Life doesn't fit here (it's a blood draining attack.. and Mollux has no fangs), level 50 should be "Wring Out".
The Reptile: Heart Scale moves don't work that way; afaik, when you encounter a Pokemon, its moves are the last four level-up moves it could have learned. In other words, level one Mollux will have Stockpile, Soak, Ember, and Wrap. I'm not sure if this is what you want. Learning Constrict at level 20 (a move that is generally both a base move and learned before wrap) is cruel.
Korski: Dragon Tail doesn't seem to flavorful, considering Mollux does not have a tail or an evolution / pre-evolution with one. Otherwise, the rest is good.
Banryu: I'm ok with everything you've got.
Nyktos: Leech Life is, again, a move that requires fangs; it doesn't fit Mollux too well. Synthesis, as you noted, seems odd; it really doesn't fit too well flavor-wise either. I'd suggest just tossing it and sticking either of its clones in level-up instead.
MCBarrett: I have no qualms here.
Forestflamerunner: Nothing learns explosion at that low of a level bar the regi trio; move it up.
Mari: No problems here.
