Get him off-stage > win the match
But, really, just get good at powershielding. With practice it's not too hard. One of my house regulars is a Falco main, so I was pretty much forced to learn the skill. Lasers become less of a problem with it under your belt. If Falco is trying to camp you with lasers, outcamp him. He wants you to come to him since his movement options on-the-whole are pretty ****ty. If you're Kirby, you've got the ability to outmaneuver and outcamp Falco if he chooses to lasercamp. Just play cheese and jump around doing a ton of nothing. He'll focus all his efforts on trying to get a hit in on you, making risky jump-ins and rushes, but you'll be able to capitalize on it. It's boring as all Hell to watch and play, but it works. If you're having trouble going head-to-head with Falco, play it the H-box way: get a stock up, and avoid Falco as much as humanly possible. Run down that timer if you absolutely have to.