Jolly is generally the standard nature for most offensive physical forms (ExtremeKiller, SD Arceus-Ground, etc.), Timid is usually used for special attacking and fast support sets, like Calm Mind, Defog, etc., and Bold is used for some slower support sets, like certain Arceus-Ghost and Arceus-Water sets.
I think a Timid and a Jolly would give you the most options.
Thank you.