Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to evolve porygon [title] Obtain an up-grade. [step] You will need to give this item to porygon to hold. When porygon is traded while holding an up-grade, it will evolve into porygon2.

Ending1: All you'll need to sell porygon2 is the final cure for ugali. [substeps] Poisson's final cure is 5 , 000 gold; this way, porygon2 will unlock your poisson's maximum cure by dropping 100 gold. Ending2: You can trade it for one high-grade tablet, or the combination of various previously traded tablets. This is pretty heavy trading as some tablets are sold for much less than others, requiring much more money. Ending3: This is the non-optimal type of porygon2 you will need to get. [substeps] You will need to trade porygon2 for an up-grade. Ending4: You can get an up-grade in gen 2 (gold, silver, crystal) and later. [title] Equip porygon with the up-grade item.

Answer format: ending1/ending2/ending3/ending4