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For Arcethorn's stats I added half of each of ferrothorn's base stats to arceus making it summary: Grass/Steel, iron barbs (these are base stats) 157 HP, 167 ATK, 186 DEF, 147 SATK, 178 SDEF 130 SPEED. That being said for the sake of argument im going to be making Arcethorn have Max Hp at all times and the max S/DEF stat to match the incoming attack so here's the results:
252 SpA Mega Charizard Y Fire Blast vs. 252 HP / 252+ SpD Modded Arceus in Sun: 600-708 (115.8 - 136.6%) -- guaranteed OHKO
0- Atk Modded Arceus Stone Edge vs. 0 HP / 4 Def Mega Charizard Y: 496-584 (167 - 196.6%) -- guaranteed OHKO
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+2 252+ Atk Talonflame Flare Blitz vs. 252 HP / 252+ Def Modded Arceus: 156-184 (30.1 - 35.5%) -- 22.2% chance to 3HKO
0 Atk Arceus Stone Edge vs. 4 HP / 0 Def Talonflame: 1164-1372 (755.8 - 890.9%) -- guaranteed OHKO
If you want anything specific to be plugged in I can test it for you
