不思議草/fushigisou (ivysaur had leaves on the back) and the call was そうそうsimilar to how bulbasaur said da ne? and (不思議花/fushigibana/venasaur flowers on the back) which I assume also went for 不思議話/不思議バナ becauae uhh.erm… because… you can’t understand what’s being said… by the pokemon or because the first appearance of venasaur in the anime was erm… in the bulbasaur evolution festival where nature builds a wall for them to sing and evolve soo…uhh… they called it a mystical tale and the call バナバ (Lagerstroemia speciosa) was uttered and the tree bloomed with flowers