Kids if there's ever one lesson you should learn today. THESE THREE HAVE HARD FINAL SMASHES TO DODGE IN THE ENTIRE SMASH BROS GAMES.

For Kirby what you pretty much need NOT TO DO is not be cornered Kirby's Ultra sword has a huge space which it takes and you cant roll or block the sword which slashes you and can kill pretty damm early. Side step doesn't work rolling towards him doesnt work too. Keep your distance and roll away from him when you see him whip out that sword of his.

For the Triple D Same as Kirby for Both games Be Careful Cause  In Smash 4 his suck can almost take up half of a Omega stage for those who play competively. 

MetaKnight:

Galaxia Darkness shares similar properties to the last two Smash moves mentioned above so roll away as he whips out his cape. you can roll towards him but its kind of risky to do so so don't try it.