Almost the (fast) busted Pokémon’s are handled by eleki to some degree.
zamazentas: outsped, chipped with volt switch into your lando, until they’re in KO range. Rarely run Tera ground
magearna: you can bait out the Tera ground, chipped by volt switch into your ground/fire type such as ursaluna or heatran. Grounds should carry coverage for flying Tera, whilst fires should have a way to address Tera water. Although both those Tera’s are revengeable by eleki if she decides to Tera (the coverage is to get her to sub 70%)
enamorous: outsped and KOd from a high HP threshold. Can bait out the Tera ground, can just Tera ice Terablast for a safe bet
chien pao: technically not handled too well, due to priority. This is the exception
urshifu-R: if it isn’t packing Aqua jet it’s easily dealt with. That said, I think every urshifu is packing Aqua jet in this meta.
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What it can’t handle:
jolly or bulky ursaluna are both brutal hitters. I’m packing balloon gholdengo as a partner on the current team in use, usually ursaluna hates hazards, so hazards + helmets on regenerators go far. Whilst it hits disgustingly hard, it’s limited by just how many Pokémon’s are immune to its moves and/or force it out, and force it to come back into hazards. 50% ursaluna can be dealt with for most teams, 100% is near impossible without correct 50/50 calls.
by the way. I know no one reads these walls of text, here’s some replays:
https://replay.pokemonshowdown.com/gen9ou-1874623480-vfrgojpj6jgpt7kzgvg7ycrmukjgswepw
https://replay.pokemonshowdown.com/gen9ou-1874751863-7z8a396ryazestczzlmjmbp5i28qe6gpw