My venusaurs flower is a yellow color. He’s not sluggish or anything and is as happy as ever. Is it normal for venusaurs to have different colored flowers?

Well, it’s a complicated sort of normal, anonymous. It seems you were lucky enough to come across the shiny variation of venusaur, so while it’s perfectly fine to have a yellow one, it’s extremely rare.

Unless, of course, the leaves are drooping or the flower is brown along the edges. If that’s the case, then please water your venusaur; he’s wilting.