Dragonite and Dodrio combined can allow Pokemon to retreat for free.
Dragonite Pokemon Power, "Step In" reads "Once during your turn (before your
attack), if Dragonite is on your Bench, you may switch it with your Active
Pokemon."  Dragonite's retreat cost is 1.  Now, add in Dodrio's Pokemon
Power, "Retreat Aid" which reads "As long as Dodrio is benched, pay 1 less to
retreat your Active Pokemon."  This gives Dragonite a retreat cost of 0.  In
addition, both of these cards are resistant to Fighting.
If anyone wants to e-mail me, my address is Woof246@aol.com.  Let me know if
you come up with any cool decks using this combo!
~Madame Butterfly