1.Stats: Should Quagsire get a stat boost, Evolution, Mega Evolution or nothing?
+110 BST can be granted.
An evolution is necessary.
A Mega would be a waste without Huge Power.
2.Should Quagsire get more abilities?
Toxic Boost and Poison Heal are options.
3.Should Quagsire get more moves?
Icicle Crash and Poison Jab are options. Drain Punch is another.
4.What additional typing Quagsire can have?
Poison, Ice and Normal are options.