RE:RE:Sell high, buy back lower. secondly, you cant get a margin account for an rrsp. Therefor shorting in an rrsp is impossible.
Buying and selling qualified stocks in an RRSP is legal. There was a court case decided n the past.
On the other hand, RRSP is totally fine for day trading. I used to refer to Prochuk vs the Queen case as justification. CRA recognizes this too in the tax folio for registered investments:
"1.89. ... This means, for example, that if an RRSP or RRIF were to engage in the business of day trading of various securities, it would not be taxable on the income derived from that business provided that the trading activities were limited to the buying and selling of qualified investments.