Time to put my HBB Comparison Goggles (TM) on.
Limited to fourth gen only:
Snivy is a green Cyndaquil.
Emboar may as well be an evolution of Magmar.
Oshawott is basically a non-bird Piplup.
Pansage and Panpour are literally the same sprite with colors changed.
Gigalith looks like Giratina and any of the other shitbag Pokemon with the "
sharp, colored jutting protrusions making the creature seem "aggressive" aesthetic.
Archeops, same thing.
Zoroark, same thing.
Haxorus, same exact thing.
Bouffalant is basically Tauros but fucking gay.
Bisharp, see above regarding "generic jutting Pokemon"
Scolipede is Giratina, if Giratina got fucked in the ass and broken emotionally by a Machamp in prison.
Krokorok is basically a ground-type Totodile.
Alomomola, see above regarding "generic jutting Pokemon"
Axew is another green Cyndaquil clone. in the same gen as the other Cyndaquil clone no less.
Braviary is the Native Ho-Oh.
This literally took me at most 20 minutes to compile. And again, I am not arguing quality, but straight-up visual distinctiveness/iconicity. None of these listed Pokemon are instantly recognizable as anything unique, half of the third-gen and up Pokemon are literal rip-offs of other pokeys.
Get rekt, gg, QED, checkmate etc etc.