"The invention King of legend that created a number of inventions such as the light bulb and the phonograph. He finally became a Legendary Yo-kai of the preoccupation, as a result of one percent inspiration and 99 percent of the effort in occult research."
T. Energison requires using the Energison Biography, which is a very rare item obtainable in the Lucky/Oni Crank in certain events.
Using the item transports you to a special area where you can battle T. Energison but doing so will consume the Biography, meaning if the player fails to befriend him while battling him, they will need to pull another Biography from the Crank-a-kai.
T. Energison can be obtained through a Yo-kai ring by obtaining the rare Yo-kai, Gasha Skull T, Doya Osi, and Doyagari.
This shows T. Energison's stat on level: 99.
"Edison" is taken from "Thomas Edison"
"T. Energison" is a combination of "Thomas Edison" and "Energy".
T. Energison is based on and named after Thomas Alva Edison, the man who patented the first commercially successful incandescent light-bulb. The phonograph, the lower half of his Yo-kai's body, is one of Edison's inventions.
When he is first summoned, a helper appears next to him, appears giving rope to his phonograph.
Curiously, he doesn't reappear any time more, not even when Edison's summon ends.