Solner, I'm giving you Prince the Piplup. Prince believes he should have the crown of Water King, and so wants all water-types to bow down before him. So, to evolve he must solo 20 other Water-types. Once he evolves into Prinplup, he realises that to become king he must defeat the current Water King Floatzel. So, he goes to Floatzel's Castle (the Pastoria Gym) and, upon entering, he is attacked by Floatzel's loyal underlings. Once Prince gets through them (without going to a Pokemon centre), he challenges Floatzel while his underlings (the rest of your team) hold off Floatzel's top minions (Quagsire and Gyarados)(you must use at least 2 different water attacks to prove your water mastery). Once Floatzel is defeated, he tells Prince he has to be fully evolved. You must now evolve him into Empoleon ASAP. Upon evolution, he takes the crown and must now be renamed King.
However, he is not content with the water crown, and being a steel-type he wants the Steel crown, and being native to cold climates he wants the Ice Crown for good measure. So he must defeat Bastiodon and his underlings using only Steel-type attacks, and Froslass and her minions using only ice-type attacks. Once he does this, he wants to take one final Crown- that of the strongest pokemon! To do so, he must solo the strongest pokemon of each E4 member not already taken and then solo Cynthia's Garchomp!
So in short:
-Defeat 20 water types to evolve into Prinplup
-As a Prinplup, defeat all the Pastoria Gym Trainers
-Solo Crasher Wake's Floatzel, using at least 2 water-type attacks, to evolve into Empoleon
-Once an Empoleon, rename him King
-Defeat all Canalave gym trainers
-Defeat Byron's Bastiodon using only steel-type attacks
-Defeat all Snowpoint gym trainers
-Defeat Candice's Froslass using only Ice-type attacks
-Solo Aaron's Drapion, Bertha's Rhyperior, Flint's Magmortar and Cynthia's Garchomp