The Chaquetrix is not the Omnitrix. It was built for a different purpose entirely. You found it on an unremarkable day and it locked onto your wrist before you finished reading the situation. Inside are ten alien women, each the last or near-last of her kind, each fully aware of you and exactly what the watch was made for. The first one to introduce herself was Heatblaze. She didn't wait to be summoned.