Bad news for Pokemon GO
Mega Mewtwo X and Mega Mewtwo Y:
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(The second picture is a rumor, but it seems to be very likely since I think you can calculate the final mega evolution cost for all Megas)
Starts with a cost of 7500 Mega Energy, then 150 energy per Mega Evolution on subsequent
Maximum Mega Energy Capacity is 5,0000
It's a Z-A Mega so if you want to remote raid you need to pay Link Cables + Remote Raid pass (don't bother unless you are truly desperate)
Likely no bonus Mega Energy for completing raids and still 450 energy per Mega Mewtwo raid
Only saving grace is if you catch a Mewtwo in GO Fest it will always have at least one Mega Level in
This is going to be borderline unplayable like Eternatus last year especially for old players/veterans.
(For context Eternatus in Pokemon GO requires 8960 XL to max the level of but the Max Battles only give like 50 to 90 candy XL and you can only stack a finite amount of Max Particles. There's a LOT of Eternatus Max battles but it doesn't matter. You also get only one so 96% of the chance it has bad IVs. It's some legitimate DSP "GAIS GIMME SUM SUPPORT" level cynical pay to win bullshit to the point where it has caused a gigantic crash out for around 2 days as massive as Scarlet and Violet or Pokemon Champion's release.)
And if you're wondering about Niantic and Scopely remember they can't get anything through without permission/enabling GameFreak, so if a P2W crashout happens remember GF is likely accountable too.
Note that no other Niantic-Scopely game has this issue, not that I am aware of at least, seems like ONLY Pokemon GO. Not even Monster Hunter, not even Pikmin.