>>33472573Because of their appearances. Upon first viewing you would expect Onix, a hard rock snake belonging to an imposing gym leader, would be very physically powerful and crush you. It is then a surprise to find out that its attack is incredibly minimal and you can make fun of it by comparing with other Pokemon. Lugia, however, does not have a build or imposition in which a player would expect it to have a high physical attack and therefore there are no expectations to be thwarted. It also does not help that Lugia has 90 Attack and not something pitiful like 45, so a Trapinch having more Attack than Lugia is essentially just as impressive as a Trapinch having more Attack than Kangaskhan but without any of the surprise.
