Scalping is most effective, productive and profitable for bull trend.
As with any type of trading, many people, even the most beginners, make money during a bull market.
If you do scalping trades with a coin that has a temp mini bear time, you will get losses.
If you trade on a margin, you can scalp in any phase of the market, open shorts and earn money. In general, based on my experience, I will say that the most profitable phase of the market for a scalper is sideways, when the price moves in the channel for a long time.