First of all, its Archie not Maxie. Go to the Lilycove beach and go up to the secret cave.
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You can find Maxie's Submarine in Seafloor Cavern on Route 128. From Mossdeep City, surf, and then use dive. Go all the way down till you get to the circle. go around it, an enter the underwater cavern. There, you will find the Submarine.
You have to go to Undella and get the HM dive. Then you can dive (:
The HM Dive is not in SoulSilver or HeartGold, for there is no deep water to dive into.
Go to the space station or something close to it on mosseddep island. There you'll find team magma trying to steal some fuel to blw up mount chimney. beat the up and then talk to steven and he'll ask you to join him to fight off Maxie and 1 of Maxie guards. Then go to steven's house (on mosseddep island) and he'll give you HM Dive. After that, go to sootpolis and after you went inside it, go to route 129 and use dive to find a secret entreance. fight off team aqua guards and and the team aqua leader himself then fly to sootpolis city. taht's as much as I'm going to say. the rest good luck! Hope this helped
Route 127 Use DIVE there its very close to route 127 and route to go to victory road . Once u dive follow the underwater path and u will find it . Inside the cave u will nee rock smash and strenth , so be ready.