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>Corsola, Carnivine, and Chimecho
pokemon used by characters in the anime, so no, not forgettable at all.
>Wormadam, Mothim, and Cherrim
Game Freak likes to show off forme gimmicks and tend to showcase them fairly often in the anime and promotional material.
>Stantler
Anyone who's played GSC would remember getting their weak-ass barely evolved pokes stomp-fucked by this thing.
>Seaking, and Golduck
Anything from Gen 1 being forgettable would be silly given that they were around wen Pokemon was still a fad
That leaves Lumineon, Grumpig, Sunflora, Huntail, Purugly, Beheeyem, and Heatmor
Lumineon is the least forgettable here given how often it gets brought up as being forgettable > meaning that people actually recall it well enough.
Heatmor is probably the most forgettable though, since it shows up in the last few hours of the game, and IIRC didn't get much screentime in the anime either.