Super Smash Bros, perhaps more than the average game, allows fairly freeform customisation of the controls and attracts a variety of opinions on what is the best or most efficient setup.
In training mode (like almost every mode), you can select a control scheme so the controls are to your liking.
You can also allow other players (beyond player 1) to be controlled by human players using gamepads instead of the CPU, by selecting 'Control' for the 'CPU Behavior' setting.
However, when I try to do this, the other gamepads don't honor the control setup selected when starting training, so you can't quickly swap between controllers (well you can, but it's a real brainpain) because they have different control setups: e.g. the jump button on one player is the shield button on another.
Is there a way to change the controller setup for extra training players, or make them all honor the mappings you chose at the start of training?