Top 5 tallest Pokemon. So when making this list, I decided not to account for alternate forms, otherwise it would have been very different. Anyway, number 5 is a tie between Steelix and Celestilla, both very tall but not that tall compared to what's next. In fourth it's unsurprisingly a little bit more than an executor, but these next two really caught me off guard. Number 3 and 2 are Dondozl and Waylord, which are obviously very big, but I didn't think they would be that tall. But the tallest Pokemon in the franchise so far at 20 meters tall is it turned it is.