RE: Basic Ruling Question, Can Machamp "take out" a LVLX SP pokemon?
To clarify, LV.X Pokemon always count as the stage below it when it is put in play. (Out of play it does not have a stage per se; it is a 'Level-Up Pokemon'.) For example, Gengar LV.X's evolution stage while in play is 'Stage 2' (because Gengar is below it and Gengar is Stage 2), whereas Luxray GL LV.X's stage while in play is 'Basic' (because Luxray GL, who is below, is Basic). And all SPs are Basics, so yeah.
Machamp's Take Out does 40 damage to Evolved Pokemon, but to unevolved/Basic Pokemon it deals an effect of an attack, in this case, instant KO. So in the case of Toxicroak G, his Poke-Body Anticipation prevents effects of attacks, so that is negated. Basic Pokemon with Unown G attached (because GUARD prevents effects of attacks) also are unaffected by Take Out. (Tristan pretty much nailed it except for the Rapidash-PA bit.)
But in pretty much all other situations, take a prize good sir.