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.

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's minds are also 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 Harp. 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.

Trivia

 * EM Wave change is similar to Cross Fusion.