>>23097264I'll make a tier list for them basing on my knowledge of the movies and lore in main games.
TOP TIER (pretty much godlike powers):
Arceus
Giratina/Dialga/Palkia
HIGH TIER (ability to cause destruction on a massive scale or ability to make it really hard to beat):
Mewtwo - powers demonstrated in the first movie are seriously overwhelming
Rayquaza (Mega could be moved higher)
Kyogre/Groudon (Primals could be moved higher)
Mew - could stand its ground to Mewtwo but lacks many of Mewtwo's powers. Additionally it can transform into anything
Kyurem/Deoxys - both of them can change their appearance instantly making them pretty versatile and capable Pokemon
Reshiram/Zekrom/Yveltal/Xerneas
Ho-Oh/Lugia
Darkrai - extremely dangerous when you sleep and pretty tough when fighting
GOOD TIER (while possessing great strength their power is more limited):
Landorus
Thundurus/Tornadus - while having great destructive powers I doubt they could overpower any Pokemon from Top/High tier
Genesect
Moltres/Zapdos/Articuno/Entei/Raikou/Suicune
Heatran - I assume its very strong in a volcano and kinda average everywhere else
Cobalion/Virizion/Keldeo
Latios/Latias
AVERAGE TIER (strength comparable to strong non-legendary Pokemon):
Celebi - its time travel ability could make it jump to god/high tier though
Victini - it can strengthen other Pokemon power by a lot
Shaymin-Sky
Jirachi
Uxie/Azelf/Mesprit
Manaphy
LOW TIER (they are just bad):
Shaymin
Phione
I have no idea where to put:
Cresselia - is anything known about it besides its ability to counter Darkrai's nightmares...?
Hoopa Unbound - don't know much about it. Its ability to warp space and teleport is pretty powerful so it could land somewhere in High Tier.
Diancie - don't know anything about it. I need to watch its movie.
Meloetta - don't know much about it but I assume it'd be somewhere in Average Tier.
Regigigas - it's slow as hell but I imagine its power being enormous. Maybe put it between Ho-Oh/Lugia and Landorus