Goku in the manga doesn't hit a power level of 8000. The power escalation in the story doesn't go that high for him. There are various factors and story arcs that determine his power growth, but 8000 isn't one of them.
In some fanfictions, Goku Black has been depicted as having a hidden power reserve. In the Tournament of Power, he could tap into this reserve and achieve a new level of transformation. This new form would give him increased speed, strength, and energy projection. He might use this form to take on multiple strong opponents at once, like the powerful warriors from Universe 7 or other universes. His attacks could become more unpredictable, such as his energy beams changing direction mid - flight to catch his foes off - guard.
In the 'goku is op and godlike as a baby fanfiction', Goku's power as a baby could be demonstrated in various ways. His senses could be highly developed, allowing him to detect danger or the presence of strong opponents from afar. He may also possess an inherent understanding of combat strategy, despite his young age. This could be due to some sort of genetic or mystical influence. Additionally, his physical abilities such as speed and agility could be far beyond what is normal for a baby. He could move with incredible swiftness and precision, almost like a miniature martial arts master, which is a clear sign of his over - powered and godlike nature.
Goku's power is measured in different forms and levels in his universe. When it comes to Legendary Pokemon, some of them have the ability to control elements like time and space. In a fanfic, Goku in his Super Saiyan Blue form might be able to match the power of a Legendary Pokemon like Palkia, which has power over space. But it also depends on the situation. If Goku is in an environment where his Ki attacks are less effective, like in a dimension where psychic powers are dominant, he might have a harder time against a Legendary Pokemon like Lugia. Overall, it's a complex comparison as their powers are quite different in nature.
The power dynamics would also change in terms of how Goku's friends interact with him. They would be very cautious as they try to figure out if it's really Goku or Baby in control. Goku's power, which was once a source of hope and protection, could now be a threat if Baby is in charge. And if Goku is fighting against Baby's control, his power might be inconsistent or erratic as the two forces struggle within him.
In some fanfictions, they might explore different universes together. Goku is used to traveling between different realms, and Power Girl could be intrigued by the new places. They could have adventures and learn from each other's cultures and powers.
Well, Vegeta would be a likely character. He might be initially suspicious of the female Goku. Maybe he thinks she's a threat or just can't believe there's another Goku - like being. He could be there to add some comical moments as he tries to understand the situation.