Multigenerational Bernedoodles are usually bred for a purpose. They are a combination of 2 Bernedoodles of different generations. Whether it's to breed for specific furnishings, coat types, or size.
"Ultra Bernedoodle" means breeding to keep a higher percentage of Bernese than Poodle (opposite of the F1b). Standard practice is to pair a Bernedoodle back to a Bernese Mountain dog, all while keeping the teddy bear look.