I can’t decide between these 3, so I’ll explain each seperately.
Gyarados
Truly one of the most iconic cornerstones of Pokemon series. The evolution line has nice contrast, from useless splashing fish to dragon-like creature that destroys everything on its path.
Kingdra
Really like the design of Kingdra, biggest favourites from gen 2.
Bellossom
There’s just something funny in this Pokemon that puts a smile on your face everytime. The card printed in Neo Genesis is one of my all time favourites in tcg. Also she’s got the moves.
I have always been partial to Umbreon and Espeon (for me they’re essentially tied, my favorite varies by the day), although Milotic does give them a run for their money.
There isn’t really a good bad ass dragonite card though. Sure the ken sugimori gb card looks great, but it banks on it’s adorableness. Best card in my opinion by that standard:
I vote Dragonair over Dragonite as well. Although I’ll take the Fossil Dragonite card over any Dragonair card (unless the non-holo Dragonair from Base would have been holo)
Breeder fields has top tier art. I loved those Neo/E series trainer cards that depicted pokemon just chillin’. Aquapolis Fan Club and Town Volunteers spring to mind. Awesome looking cards.