Those two are arguably the most sought after in sv, probably won’t get someone to trade those for regular shinies. If I am assuming correctly that you have violet, my recommendation would be to do a second play through and trade violet exclusives for them.
#LF : Gouging Fire , Raging Bolt FT: Shiny Husian Sliggo and Shiny Smeargle
robust horizon
Ahh, other thing you could try is finding a scarlet player and doing a custom trainer name and trade miraidon.
Basically find a scarlet player that want miraidon in a specific trainer name/ ball. Create a second account on the Nintendo and start the game under the wanted trainer name.
Some players really want all their mons in their name, which is hard to do with version exclusives.
Np, good luck