honestly this sounds a little crazy upfront but... i really like it in practice. last year I thought the terror's crash wake + gyara avi was cool but I rarely used it myself just bc it wasn't something that I thought represented myself enough. even now when I'm back to presenting more masc I still would probably taken a fem trainer in that situation if given the option.
idk if space issues on the sim would be a problem but i really ask those in charge to seriously consider this proposal. i think it really goes a long way in letting everyone take pride in their team and in their expression.
and of course it doesn't have to be purely about gender identity or whatever, some people are just going to naturally prefer having Cool Dude avatars and some people want Pretty Girl avatars, look around at smogon PFPs and you'll see what I mean pretty quickly. the team representation is still going to be there with identical mascot pokemon and trainer aesthetics anyways.
as for logistics, ex. sclIIplatoonm/sclIIplatoonf work for avatar names, let players sign up for their choice, seems simple enough
edit: pay the artists appropriately tho if we're getting 2 avis. support ur artists!!!