Hey, great project, I like it a lot! Just a few questions (using Firefox):
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There's slight overlap here as you can see (the grey thing is the scroll bar). Doesn't really hide any info, it's just a cosmetic thing I'd consider changing
2) Are you guys planning on adding random battles support (including the info on potential sets / options that the "random battles" option in the official calc shows)?
3) Are you planning on adding an option to toggle certain things? I feel like there's a lot of info that isn't always neeed. Especially data on my own team is somewhat superfluous I think - All you'd really need are the moves and the corresponding damages + stat stage modifiers. So being able to toggle the display of my own ability, typing, nature, item and stats would definitely help declutter the appearance. Those are things one doesn't really need to modify in the calc in most cases, and they're already available when hovering over the Pokémon
(I haven't tested if things like trick / entrainment get accounted for or if those require manual changes, but I assumed they would lead to automatic updates)
4) I think a visual separation between the three fields (my team, weather / screens, their team) would also help clean up the appearance