Memorability is pretty subjective. I don't think Gen 5 is necessarily more inherently* forgettable than, i dunno, gen 4 or 7 or whatever
Personally I find Heatmor pretty distinctive: anteater is cool, i like the pipe tail, the fun claws, the durant connection, flame tongue. Statistically it might be "whatever", but he's a neat dude. Also got a signature move in gen 7, for some reason (saw more distribution in gen 8)
But obviously Worldie memory holes it. It's just how it goes.
*Aside from the fact that there were 156 of them. By numbers alone you're probably more likely to forget a gen 5 pokemon than a gen 6 pokemon.
Personally I find Heatmor pretty distinctive: anteater is cool, i like the pipe tail, the fun claws, the durant connection, flame tongue. Statistically it might be "whatever", but he's a neat dude. Also got a signature move in gen 7, for some reason (saw more distribution in gen 8)
But obviously Worldie memory holes it. It's just how it goes.
*Aside from the fact that there were 156 of them. By numbers alone you're probably more likely to forget a gen 5 pokemon than a gen 6 pokemon.