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There Are Pokemon You Can Adopt From The Adoption Center. Note... They Will Only Show Up When You Are The Right Level To Get Them And If You Have The Money It Costs To Adopt Them. Below Are The Levels And Prices You Need For The Pokemon From The Adoption Center. 

     Buizel – lvl 1 – $8,000

     Machop – lvl 2 – $10,000

     Happiny – lvl 5 – $15,000

     Snorlax – lvl 10 – $50,000

     Heracross – lvl 20 – $100,000

     Skitty – lvl 30 – $150,000

     Scyther – lvl 60 – $250,000

     Cranidos – lvl 120 – $500,000

    Celebi – lvl 250 – $50,000,000

There Are Pokemon That Only Certain Teams Can Obtain They Are Listed Below.

      Team Adoption Pokemon

     Team TPPA: Gible – lvl 150 – $1,000,000

     Team Galaxy: Beldum – lvl 150 – $1,000,000

     Team Aqua: Dratini – lvl 150 – $1,000,000

     Team Magma: Bagon – lvl 150 – $1,000,000

     Team Rocket: Larvitar - lvl 150 - $1,000,000