Mario & Luigi: Brothership developer discovered, and it's not the one fans believed
That is why, since the announcement, fans believed the developer was ILCA, another studio that had previously worked with Nintendo and The Pokémon Company for Pokémon Shining Pearl and Brilliant Diamond, and employs several peopole from Alphadream, the studio that used to make the Mario & Luigi series, now defunct. However, that was not the case.