Better option to max out?

I'd prioritze Tyranitar then Golem and leave the rest as it is. Ampharos is more of a trophy mon. There are stronger electric types around. Probably Lapras but meh. Now for Blissey... it would depend but I really don't power up defenders even before the gym rework. Especially now, all Pokémon regardless of their CP will fall after 3 battles if at full motivation. What matters for me when defending is the resources consumed by the opponent BUT with the addition of potion drops on raids, it's really pointless IMO.

Golem number 1. Good against raikou and good against entei. Tyranitar next. Good for mewtwo and it's okay against entei. If u have 6 maxed golem already then just save dust and do tyranitar unless u got 6 maxed ttar then just max what u want lol. About 205k dust from 20 to 39.