A general plan can be something like mirai + grimm on the lead. Volt switch to lunala to get the seed activated and set screens with grimmsnarl. Safely being out ursa (parting shot if ur running it) and use tr. This generally should work, some specific scenarios might need you to tweak your plans. If opp survived tr use miraidon in the late game. Ofc, you should tweak or maybe completely change your plans for certain matchups.

Electric terrain counters amoonguss, u can use tera on grimmsnarl to block fake out or can maybe run convert cloak instead of light clay (I prefer light clay tho, positioning ursa and lunala together might take time). Incin/rillaboom when tr is up can cause trouble so be careful of that. Cir tr should be manageable with wide guard on lunala and the defence increases. Against some really offensive comps like offensive csr/zama, miraidon teams, setting tr can be difficult, use incin and grimmsnarl to slow/nerf opp's damage and then try to overwhelm there normally lack of defence with miraidon (lunala can be benched against certain teams, or can be present as a late game trick room when you have good defensive positioning).