Mewvesets 2.0 (post rebalance & 2nd charge moves implementations)
Hello, fellas!! first of all: the question is not about whether Mew with 2 charge moves is viable or not or a waste. Is about something fun and a puzzle for everybody to play with. So, let's begin!
Let's say that one guy (I, probably) wants to get a second move for his Mew. Ok until there. Since there was an article explaining some of the mewvesets, we usually think that the combo "Shadow Claw + Ice Beam" would be the best in most ocasions. However, now there is the possibility of two charge moves in one mon.
The question is: which mewveset do you guys think it makes Mew more viable for past, current and future raids or destroying gyms? Now, let's begin :D

Answers
I haven't really seen a need to power my mew up, as most pokemon that are substantially less expensive still do out preform it.
However If I were to use one, probably shadow claw/dragonclaw to deal with latios/as and giratina, and throw in bulldoze to cover metagross/tyranitar, I dont see much of a need for psychic moves as I rarely see poison types because metagross/flygon/groudon hard counter and even less fighting types like machamp now that mewtwo's got focusblast and shadow ball and few top tier master league and ultra league pokemon are weak to fighting, outside tyranitar, the vast majority resist fighting
The most interesting Mewvset would be for PvP. For Raids and Gyms, there's better solutions.
Infestation generates energy the most quickly, followed by a tie between Shadow Claw and Poison Jab.
In terms of Damage/Energy^(1.5), my metric for charged moves, they come up in this order:
Rock Slide
Thunderbolt
Surf
Wild Charge
Grass Knot
Shadow Ball
Stone Edge
Dragon Claw
Mix and match as you see fit.