I don’t know how to sprite and honestly I don’t have time to do so anyways, so here’s some ideas to sprite and some talented spriters can make them and perhaps reply as a comment.
And maybe a dev can see these and implement them in Epsilon or a feature update that will never come.
1. Delta Mega Charizard X with Tough Claws ability
Considering it gets good STAB contact moves like Shadow Force and Outrage (if you want to play safe, Shadow Claw and Dragon Claw) , coupled with Dragon Dance, a physical Delta Mega Charizard X isn’t completely unviable.
As for design, it can pretty much resemble regular Mega Charizard X, except the flames are replaced with “ominous wind” and its body would be a purple-ish skeleton like Delta Mega Charizard.
2. Mega Delta Blaziken, Mega Delta Sceptile and Mega Delta Hydreigon
If Delta Typhlosion got a Mega Evolution like its regular variant, why does Delta Blaziken, Delta Sceptile and Delta Hydreigon not have one? I’m running out of ideas for these designs, go wild.
And Mega Delta Sceptile would have a different stat distribution from regular Mega Sceptile, like swap around the effects maybe? Like +40 Attack and +25 Special Attack instead of the regular Sceptilite effects which is the other way round? I don’t know, I just want it to utilize Dragon Dance as much as possible.
tbh mega delta pidgeot needs a physical mega too
3. Delta Ash-Greninja
I know Ash-Greninja isn’t in this game, but since some people have made Ash-Greninja sprites before, I figured someone could make a new one for “Battle Bond” Delta Greninja.