>>32349911Shedinja was primarily used as a gimmick and a counter to rain teams, which while nowhere near as prevalent without an OU approved Drizzler, were still dangerous and ruined a number of pokemon when Tyranitar was not on the menu. By no means a staple, but Shedinja's gimmick is one that survives even in today's world of sneaky pebbles, increased anti-bug coverage, and damn lies.
Walrein was a defining pokemon of gen 3, and to a lesser extent gen 4. Stallrein is a term that still garners respect from oldfags.
I'll admit I totally forgot Breloom, Spore-punch was hot shit back then.
Flygon really wasn't very good back in gen 3. It's middling stats were just as punishing then, and the odd status of physical and special moves meant more things were prone to randomly running ice beam.
Gen 2 introduced Skarmbliss, Misdreavus (Who was very viable gen 2), and a handful of others, which is certainly a smaller number than gen 3, but there is almost half as many gen 2 pokemon as gen 3, making the ratio still better.