As with most of my suggestions, I feel as though I have poorly worded it above, so I will try my best to explain down here.
You know how when you type something into the search bar at the top, before you're done typing, a list of things that have what you're typing in it appears below the search bar? So, for example, if you type "electric", this will show up.
Well, you can, as with almost any page on the site, start to type in the names of the Ultra Beasts, and the pages for the Ultra Beast that you start to type in will be linked below the search bar, so, if you start to type "xurk", Xurkitree will appear below the search bar.
I think that it'd be useful if we could type an Ultra Beast's "codename" into the search bar and have a link with their "codename" linking to the page of the corresponding Ultra Beast. So, for example, if you were to start typing in "Lightning", "UB-03", or something along the lines of that, a thing would appear below the search bar linking to Xurkitree's page, as Xurkitree's "codename" is UB-03 Lightning.
This isn't a super important suggestion, but I just that it would be useful to not have to type in "Blacephalon" every time I want to find Blacephalon's page.