EM Wave Change

An (Denpa Henkan in Japan) is performed when an EM being fuses with a compatible human. This creates a more powerful being, able to interact with both other EM beings and regular humans.

EM Wave Changing
In the games, the protagonist Geo Stelar has to find spacial distortions (signified by orange portals). It is not shown whether other characters must keep to the same accord.

In the anime, however, any EM being and their compatible human can EM Wave Change by shouting the phrase "EM Wave Change! [Name], On-Air!" in a similar way to the Megamerge technique.

In the third game, Geo(and all others who have the ability) can Wave Change in any area, however the method has changed. Upon Wave Changing for the first time in the game, the Wave Changed being is assigned a "Transcode", and a ID number. (Mega Man's is 003.) After that, the user must shout, "Transcode! (insert name of Wave Changed form here)!" in order to transform.

Unregistered, and thus illegal Wave Changes still use the old phrase, however.

Characteristics of Wave Change
During EM Wave Change, the human becomes part of the wave world, and is thus subject to the same rules as other EM beings. The EM being is then able to give its powers to its compatible human, and the human is able to use Battle Cards as actual weapons.

During Wave Change, the EM being and human are combined into one consciousness, though this process can take time even if their bodies have fused (and it sometimes just freezes if the two are resisting assimilation). Two notable exceptions to this are Geo Stelar with Omega-Xis as well as Sonia Strumm with Lyra. Some EM beings, mostly FM-ians, will try to take their human partner as a host body, and attempt to subsume their human's consciousness completely.

Solo Wave Change
In the second game and during the Tribe season of the Star Force anime, Solo is shown being able to EM Wave Change without the aid of an EM being from which to borrow his power. Through simple willpower, and the effects of an "ancient Star Carrier," this allows Solo to become the EM being Rogue. However, he gains his own EM being named Laplace in the third game of the series. Laplace, however, does not aid in Solo's transformation. He becomes a very powerful sword.

Video
EM Wave Changes from the MegaMan Star Force anime: CJiPK6eSOO4

Trivia

 * EM Wave Change is similar to the Cross Fusion in the Rockman.EXE anime, and the background used when a character is doing an EM Wave Change in the anime is the same as one of the backgrounds for Cross Fusion.