I know i can do a quick research but give example of when btc was in bear market, the 2018 beginning of year, and some alts still moon ?
any example
IIRC, even though bitcoin went through a bear market on that year, there were some altcoins that didn't go full bear by that time. But if you're asking for that specific answer, you should use your own time finding it.
But if what you mean if the same might happen, yes, possible after this bull run.