A: Mewtwo VMAX cards generally cost $10-100+ for regular variants, while Rainbow Rare and Secret Rare VMAX can be worth $50-1000+ in mint condition
If you are a Spanish speaker, the already mentioned communities from Argentina and Chile do a great job education about the hobby and producing very relevant content, so dont hesitate to check them out

Sort Card Type Pangoro #140Uncommon $0.07 Pangoro #68Rare $0.37 Pangoro #75Rare $0.31 Pangoro #82Rare $0.31 Pangoro #78Rare $0.37 Pangoro #94Rare $0.38 Pangoro #120Uncommon $0.19 Pangoro #174Uncommon $0.05 Pangoro #80Rare $0.20 Pangoro #93Uncommon $0.04 Pangoro #99Uncommon $0.05 Pangoro #113 $0.15 Pangoro #62Uncommon $0.08 Pangoro #63Uncommon $0.09 Pangoro #59Uncommon $0.14 Pangoro #51Common $0.16 Pangoro #35Common $0.29 Pangoro #29Uncommon $0.65 Pangoro #32Uncommon $5.00 Pangoro #56Uncommon $2.99 Pangoro #64Rare $5.00 Pangoro - 054/094 #54Uncommon Pangoro - 13/15 #13Promo $0.31 Pangoro - 68/111 (Cracked Ice Holo) #68Holo Rare $2.36 Pangoro - XY50 #XY50Promo $2.26 Pangoro (Energy Symbol Pattern) #140Uncommon $0.30 Pangoro (Love Ball) #140Uncommon $0.27 Pangoro #32Uncommon $5.00 Pangoro #64Rare $5.00 Pangoro #56Uncommon $2.99 Pangoro - 68/111 (Cracked Ice Holo) #68Holo Rare $2.36 Pangoro - XY50 #XY50Promo $2.26 Pangoro #29Uncommon $0.65 Pangoro #94Rare $0.38 Pangoro #68Rare $0.37

If you are seeking to own a complete master set, then it is common practice to include all variants
You can get yourself a sizable body for only four mana in decks like Progenitus, Reaper King, Zacama or The Ur-Dragon, to name a few
Hitmonchan ex is classified as a 2-Stars card in the Mega Rising set