Shadow ball

I strongly agree with this. They should really improve Ghost and Dark charge moves, or even introduce more/better ones (I think introducing new moves along with Gen 2 would be very convenient anyway).

Totally, on the original game the strongest factor about ghost and dark pokemon was not strenght on most cases but strategy, since poGO cannot adapt these strategies they should make them more destructive.

Shadow Ball should use 50% energy and have damage and time similar to Psychic, Flamethrower, Thunderbolt, Ice Beam, etc.

When they start introducing Gen2, They absolutely have to add new moves. There are a lot of Gen2 pokemon with awesome iconic moves that are not in PoGo yet.

Croconaw, Feraligatr, Girafarig, Steelix, Granbull, Ursaring, Houndoom, and Tyranitar should all learn the dark type move Crunch, which should fall into the same range of 50% energy, 55-65 damage, and 2.5-3.5s

I agree. They also need to increase the ghost/normal & normal/ghost resistance. I understand that they don't want immunity; but it should be more than just a 25% resistance.
If mewtwo isn't going to wreck the game, there needs to be a good dark charge move.