I am flying from Manila to Tokyo, Narita with Philippine Airlines. Then onward to Calgary, Canada with Air Canada. When transferring in Tokyo, do I need to collect my baggage and clear immigration and customs? Even if I don't, I found they use different terminals. Is it possible to go from Terminal 2 to Terminal 1 airside?
tl;dr: You need to clear security but that's all.
Moving luggages between airlines like this is called interlining and Air Canada interline partners include Philippine Airlines (PR).
There is an inter terminal shuttle so you can certainly stay airside:
This page provides information on how to connect between international flights without collecting your baggage or entering Japan.