Update pokedex.js

Started adding new megas
Update Pokedex with new Megas

Added Mega Alakazam, Mega Gengar, and Mega Gyarados
Finished updating with new Megas

Mega Gengar and Mega Gyarados were unfinished. Done now.
Merge pull request #396 from mal20k/master

Added a few new Megas
Merge remote-tracking branch 'upstream/master'
Implement Aromatic Mist and fix its name
Implement Fell Stinger
Update Rapid Spin: It now removes Sticky Web as well
Update confirmed old mons stat changes
Sticky Web update: It only affects grounded Pokémon
Merge remote-tracking branch 'upstream/master'
Sticky Web is a Status move, not an attack
Implement Gooey
Nature Power now calls Tri Attack
Play Nice ignores Protect
Fix mistakes
Spiky Shield damages attackers
Added a few more Megas

Mega Gardevoir, Mega Tyranitar, Mega Aggron, Mega Banette, Mega Pinsir.
No height and weight for Mega Gardevoir, set to same as Gardevoir for now.
Merge pull request #398 from mal20k/master

Added a few more Megas
Update Pokemon data