Looking for an anime, mecha type. I remember there was an episode where the plot was like this. The villain was a sun-like figure.

Dream Knight: Iron Piggy

Tiangu, a boy who dreams of becoming a hero every day, often makes jokes. He likes Ellie and hopes to become a member of the special guard. Ellie was impressed.

Ulason, a pig-shaped robot, dreams of replacing an oxygen engine.

Xiaxia, the leader of the Fantasy Knights of the Rococo Kingdom, is handsome, has a sense of justice, responsibility and loyalty, and is regarded as a love rival by Tiangu.

Ellie, a robot technician, is Tiangu’s crush.

Mikal, the tactical director of the Rococo Kingdom’s Seventh Guards.

Dr. Huhu, Avery's father, likes to make strange clothes for Tiangu.

Stalian, a combat robot, is owned by Xia Xia.

Clayjian, one of the members of the Fantasy Knights of the Rococo Kingdom, fights hard to surpass the Knights.

Kian, one of the members of the Fantasy Knights of the Rococo Kingdom.

Brace, one of the members of the Fantasy Knights of the Rococo Kingdom.

Lu Qi, one of the members of the Fantasy Knights of the Rococo Kingdom.

Astorus has always wanted to grab all the dream energy and create his own Cuenca empire.

Talaurangst, the commander-in-chief of the Rococo Kingdom’s special guards.

I actually... found it out