I just used this video
https://www.youtube.com/watch?v=YN46UsCxIbQ (shame)
I mean I guess maybe some of them would get better with repetition but that's stockholm syndrome
I have now watched most of the series
don't ask
The list is only considering the version used as the actual anime opening, not the album version or movie version or whatever
PERFECT IV ARCEUS TIER:
Johto Journeys (Pokémon Johto)
Sun and Moon (Under the Alolan Sun)
ARCEUS TIER:
original series (Pokémon Theme)
XY (Pokémon Theme)
Black and White (Black and White)
XYZ (Stand Tall)
HIGH TIER:
BW Rival Destinies (Rival Destinies)
Adventures in Unova and Beyond (It's Always You and Me)
Advanced Battle (Unbeatable)
Diamond and Pearl (Diamond and Pearl)
Galactic Battles (Battle Cry)
MID TIER:
Johto League Champions (Born to be a Winner)
Master Journeys (Journey to Your Heart)
Journeys (The Journey Starts Today)
DP Battle Dimension (We Will be Heroes)
Advanced (I Wanna be a Hero)
Master Quest (Believe in Me)
Advanced Challenge (This Dream)
LOW TIER:
Ultra Legends (The Challenge of Life)
Adventures in the Orange Islands (Pokémon World)
XY The Series (Be a Hero)
Battle Frontier (Battle Frontier)
SHIT TIER:
Sinnoh League Victors (We Will Carry On)
Ultra Adventures (Under the Alolan Moon)