Complete the game, then start a Clear New Game session by loading the cleared saved game file. Any Shinki that is purchased at the Official Shop will now have up to three alternate colors. Additionally, Shinki of any Love Level can be readily dispatched when the Junk Shop opens later in the game.
Defeat the F1 Champion, complete the game, then save it. Select to continue the game instead of starting a new cleared game. You will get an e-mail stating that Club Valhalla has reopened under new management. Your previous enemies from the Game Center can now be found here.