well, its an ok cross up if youre coming from a platform above or something like that, but its usually going to be more of a defensive maneuver when you have literally no other option to cover that angle other than bair. the sweetspot isnt hard to land if you combo into it, but if youre actually landing it from neutral then your opponent probably isnt very good. it is -2 on shield, which is decent for staying safe, but again, its probably not going to come from an offensive manuever while approaching out of neutral. all of the uses that dair has comes from when you have your opponent at a disadvantage already, or as a last resort to cover your backside. in terms of using this against squirtle, i think it has very few uses, because his side b is going to go right through it, and he is one of the smallest targets in the game, making the already small chances of landing a sweetspot even smaller. its also just too CCable. sethlon may use it to cross up, but the situations he uses it in are when theres no other better option and hes forced to use it. if you use it too offesnively, youre going to get punished against anyone remotely competent.