He likes to surround himself with auras and protective enchantments, as well as control the board
Rest in Peace, Dauthi Voidwalker, and Leyline of the Void are a few prominent examples of effective graveyard hate
So if a creature with 1/1 printed on the normal side and 2/3 printed on the flipped side has a +1/+1 counter on it, it changes from a 2/2 to a 3/4
It also didnt help that Virizion Genesect, the deck that really had a chance against Seismitoad was a bit expensive, so most players could not afford getting it
They have since continued to contribute during the Scarlet & Violet era with cards including Shuppet from Scarlet & Violet base, Tropius and Sudowoodo which will likely appear in Scarlet & Violet Paldea Evolved , and the Bellsprout line from Japan's upcoming Pokmon Card 151
She certainly can, if you have no other non-Gnomes to trigger it, but in most cases youll want to hold her back out of combat, and let her Gnome forces do the work