Trump will go with a national emergency declaration (we've had 58 of those declared just since 1979) in an attempt to fund and build the wall the military route. That will be halted due to an injunction. Then it'll end up at the Supreme Court. Assuming the Democrats don't offer a compromise to Trump that is.
I thought your remark that there had been so many national emergencies was interesting. This turns out to be true — color me surprised.
Almost all of them seem to not involve spending money — they are prohibitions on money transfers. I assume this is where the emergency-for-wall would run into trouble, because it’s the Congress that appropriates money.