HGSS Whitney still shouldn't be a cakewalk with Heracross unless you raised it to Level 19 for Brick Break (which ime is a major slog since you catch it at a super low level after already beating Bugsy and there aren't that many decent grinding options immediately afterwards).I fought Whitney in HGSS. I have a Heracross. That's the Gym battle.
I feel cheated. Like, that's it? No unstoppable Rollout chain? No Stomp/Attract stunlock? No Scrappy reveal to outsmart your outsmarting of bringing a Gastly? No laughing and drinking milk as your attacks bounce off her 95/80/70 defenses?
I guess you're supposed to feel cathartic from sending the demon of your childhood to the Shadow Realm, but...I just feel sorry for her.
Having said that, I remember having the same 'that wasn't as cathartic as I was expecting' moment when I OHKO'd Miltank with a crit Fire Blast from Quilava lol.