For sure, altcoins can pump during a bear market. ICP pumped 25% over the last week. If you had bought during the last few months you would be in profit.
It's not only ICP, OP was also facing a huge pump since a few weeks ago and it's still in a big pump. I have made 4x profit since i was buying OP at the bottom price. Any altcoins in the market can be pumped easily by the whales. The trend didn't matter a lot as long as there will always be the new to bring the hype to the token. I have seen so many tokens have experienced the same thing like ICP and OP. ETC was also pumping so hard after merged announcement