On a Mac, it's pretty easy. Shift+Option+Dash. Option and Shift+Option plus a lot of keys does a lot of different symbols. With letters, you can hold the letter to open a menu of accents, so it's ridiculously easy for me to type Pokémon correctly. I hold the E and hit 2 to get the correct accent.

On a Windows computer, yes, it's an ALT code. ALT+0151. I've committed it to memory so it's nothing for me to type that if I'm using a Windows machine. 0150 is the en dash, which is a little shorter, and has a different function.

I'm on a US keyboard right now, but it's a Mac keyboard. I think the only difference is, instead of Ctrl-Win-Alt I have Ctrl-Opt-Cmd. And then Cmd-Opt-Fn-Ctrl right of the space bar. I think the rest is basically the same. Except my F keys do different things, like F3 isn't search (that would be CMD+F) it's Mission Control, kind of like Alt-Tab in Windows but way, way better.

On some phones you don't have to go into the number/symbol section. HOLD that button and it makes that keyboard pop up; now DRAG to the symbol or number you want and LET GO, it'll type it and bounce you right back to the ABC keyboard. You can also linger on a symbol to get the alt symbols. So, in practice, hold the ?123 or whatever key, drag up to dash, but don't let go, linger for a couple seconds, then slide over to the em dash and release. Should take you back to the ABC keyboard.