Here's a series of Pokemon icons I've made that you are more than welcome to use! I'd appreciate it if you code it so that clicking the icon will link back to this page, but I won't be upset if you don't. Just don't pass them off like you made them yourself, and don't hotlink them.
I made one for every pokemon (as of April 2024), so there's quite a lot of icons for this page to load. If some didn't load the first time around, try refreshing the page.