Some of the trophy descriptions are pretty good:
Upperdash Arm: "To avoid causing unwanted mess, we recommend removing the Upperdash Arm before eating."
Porky Statue: "A statue of Porky built under the orders of Porky to honour the great exploits of Porky as acknowledged by Porky."
Goldeen: "[..] when it uses Splash... It's super ineffective!"
Hammerhead: "It's great for launching people, so pick it up and throw it at someone! How about that wally waving the hammer handle around? He's just asking for it!" (I always read this in a Cockney accent, which just seems to make it funnier (no offence to anyone who actually has a Cockney accent!))
Baby Mario: "Give him a Super Star, and he'll turn invincible, just like grown-up Mario! If only it gave him a moustache too... That would be awesome."
Thwomp: "If anyone tried to break into your house, it would just go "THWOMP!" right on their head. Yep, a Thwomp would make a great home-security system. Unfortunately, they're not available in shops. Sad times."
Kapp'n: "You might assume that his favourite letter is the letter arrr, but you'd be wrong: his one true love is the C."
Pokémon Trainer: "He fought to be the very best - like no one ever was - back in Super Smash Bros. Brawl. To smash them was his real test - to launch them was his cause."