To be honest, this is how I think the ranking of the scarfers should go
A: Lando-T, and Tyranitar (T-tar should be A+ IMO but until it rises in the regular VR, A is fine).
A-: Keldeo, and Jiachi
B+: Heatran, Exca, Garchomp, and latios
As for the Pixi lure sets, Jirachi...