When training an amiibo, you’ll notice that they stop taunting after they reach a certain level threshold. While it depends on the individual amiibo, it’s usually in the 30s. Luigi is in fact, the only exception because his down taunt is also an attack, but he rarely uses it.
But if you take an amiibo and modify it using an NFC modifier like Powersaves, you can lower its level all the way down to level 1. It will still behave the same, but it will now occasionally taunt. The amiibo will also level up as normal. How cool is that?
The fact that an amiibo will behave the same regardless of level (excluding the taunting, of course) indicates something else to us. It indicates that the only purpose of having amiibo level up is to A. provide a clear indicator of the amiibo’s progress, and B. apply the amiibo-specific bonuses at a gradual rate. Again, save for the taunting, levels have no actual impact on the behavior of the amiibo.
If you’re a serious trainer, you may consider the effects of raising and lowering your amiibo’s level when you wish to teach it certain moves. Because its Attack and Defense bonuses increase as it levels up, but are removed if edited down to a lower level, one could lower an amiibo’s level to more effectively teach it which attacks to use. Theoretically, this would be a more effective teaching method because the amiibo would take significantly more damage, causing it to alter its behavior more than it would if it were level 50.
This is one of those neat little things that aren’t immediately obvious unless you poke around with amiibo. There’s quite a few!