1.Stats: Should Gyarados get a stat boost, Evolution, Mega Evolution or nothing?
Gyarados cannot get a stat boost, as it already has the highest BST for a common species.
Because of the above, Gyarados cannot get an evolution. It can get a mid-stage, however.
Gyarados already has a Mega, though it is quite terrible due to its in-game role as Lysandre's signature. It deserves a better one.
2.Should Gyarados get more abilities?
Yes. Gyarados only has two abilities, and its third ability chance was temporarily lost due to its Mega. Some options would be:
- Anger Point
- Water Veil
- Strong Jaw
In general, yes. Acrobatics and Recover are the most obvious ones, followed by Coil, Dragon Rush, Glare, Sucker Punch and Aqua Jet. Overall more Flying and Dark-type moves would help.
4.What additional typing Gyarados can have?
Gyarados already has a Dark-type Mega, so the remaining potential types would be Normal, Dragon, Electric, Steel and Fire.