That's entirely something that you are free to come up with and plot out with other players. All the manipulation is being done by player characters, so it is not something we can rule on as mods. If you have an eagle-eyed character, they can certainly notice some people seem to be pushing for Malva (though there'd really be no connecting all these separate people to Team Rocket specifically, and there are also some people who really want Bede in the spot) and if they want to call out one of these Malva-enthusiasts that is something to discuss with those players.
The Elite Four, at least, won't listen to any accusations as they've put a lot of work into vetting both individuals and haven't gotten any indication that either of them is not above board. So just a random accusation without evidence is going to come across as more petty than something to actually take into consideration.
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The Elite Four, at least, won't listen to any accusations as they've put a lot of work into vetting both individuals and haven't gotten any indication that either of them is not above board. So just a random accusation without evidence is going to come across as more petty than something to actually take into consideration.