GreatSaiyaman123 said:
Is it possible to suppress a form before mastering it?
Depends on what you mean by ''suppress''. Uncle Withheld has shared his
deep knowledge with this forum multiple times, to clear out the
confusion about stuff like Nappa powering up etc
1. Chi output
A fighter naturally emits more chi when he fights than when he's calm
(ex. Nappa, Scouter Vegeta, 1st Form Freeza). That doesn't
necessarily mean they can suppress their power level (we'll talk about
that below). Biological senses can tell the difference between how the
chi feels during the calm state and the battle state, but that's not the
case for the scouters, which will always pick the same number. Ex.
Vegeta's scouter PL would always be 18.000, both pre and post his
power up sequence, but Goku's biological senses definitely felt a
difference.
2. Modify battle power
This is the ability to trick the scouters into a fake power level.
Biological senses can also be tricked at some extent, though an
experienced biological sensor can tell (ex. Goku sensing Fat Buu's
power). Also, the person that can modify his battle power can
suppress his chi output to absolute zero, thus becoming totally
invisible to both scouters and biological sensors.
To return to the topic, SSJs cannot modify their battle power
before practicing the form, but they can still vary their
chi output like everyone else (ex. Tenshinhan noticing Yardrat
Goku's standing ki).