The 25th Anniversary Rarity Collection has set a new standard for how to make the core cards of the game more accessible through multi-rarity print runs and card selection
Deggers adds, Its predatory
So knowing this about the first two Pokemon in this line and looking at this specific Porygon-Z, the main reason you would want to use this card in a deck is for its Digital Reboot move, the reason you would want to use this move so often is to be able to reuse an Ability from let's say a Stage 2 Pokemon every single turn, like Aggron from Dragons Exalted (if you're playing in the expanded format) where you can use its Toppling Wind Ability to discard the top 3 cards of your opponent's deck every single turn and hopefully be able to win the game that way
Endless Foot Assault April O'Neil, Live on the Scene [2GSBkjgLSsCv5pJCYknUKI] Baxter, Fly in the Ointment Here Comes a New Hero
#7 Given that you can summon a Blue-Eyes, Ultimate Dragon by special summoning it when you sacrifice 4x BEWDs, I feel like they should NOT be legendary, as you'll need multiple on the field at a time