"I suppose I'll start at the most important part," 21 said crossing her arms. "Goku, Vegeta...Kinoko...you can't fight Yuvo you'll die if you do."
Goku and Vegeta looked at 21 at this and the serious expression on her face, Vegeta scoffed and opened his mouth but 21 spoke having a feeling what he was going to say, positive it was an insult in her direction and doubt.
"Yuvo is not a person that can be beaten by fighting strength alone, he's able to mimic energy when he feels it. To be specific he can feel your ki and how it flows and mimic it himself. By doing so he amplifies his own strength while draining any energy in the air, he can increase how much is in his body through physical contact, basically draining it."
"...like 19," Goku said bringing a hand to his chin.
"You mean that fat android?" Vegeta said. "That thing was a joke."
"He can drain like 19 but he's more like Cell in terms of structure, not techincally an android but a bio creation. To the best of my knowledge he was one of Gero's failed creations."
"If he's a reject than why is he a problem," Vegeta added.
"Well he was a failed project because of control, not power," 21 said. "The problem is if you fight him he'll just mimic you and become stronger, and he repeats this process indefinitely, meaning punching him in the face is actually a bad thing."

[i]"...well this seems like a great situation,"[/i] Ryo thought leaning against the wall.
That meant using energy against him would power him up, and going off that earlier scene he was immensely powerful already. He did seem pretty happy when everyone turned Super Saiyan almost like he was expecting it, or needed it. 
"There is some hope though...that's why I've been...working with him looking for a weakness."
Goku looked over at Kinoko before looking back at 21, his eyebrows lowered a little and he touched his chest.
"Why didn't you tell us...or ask us for help. We wouldn't have hesitated to assit you."
"Speak for yourself Kakarot," Vegeta said causing Goku to glance at him.
21 closed her eyes and slowly shook her head, a worried expression fell over Goku's face and 21 looked back out the window.
"Yuvo approached me having my data...he believed me to be your enemy being a fellow creation...if I spoke to you he would have realized that I'm not...and he's been watching me for a bit now. Forgive me...I wanted to find out as much as I could to find a weakness."