Raging Thunder is 14 characters, that's too long, max is 12.
The other 2 Beast Paradoxes are _____ing _____, Noble Pyre doesn't match.
The Iron Musketeers are typically named after where their extendable blades come from so: Iron Edge, Iron Blade, Iron Ring, etc.
Something that references Terrakion's horns.
As for Past Entei? Walking Wake and Raging Bolt are fairly consistent with each other, and given Entei is a ceratopsian of some kind according to Khu: Blazing Horn.
Alternatively, I would suggest Roaring Fire, to reference Entei's dex entry where it's roars cause volcanos to erupt, but Roaring Moon already has Roaring and the -ing word can't be longer than 7 letters without cutting into the space for the second one.