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Put more thought into this than I thought I would, but I think I have all my bases covered for adventuring around, and doing it with my favorite mons as well. Stronger or larger Pokemon would surely make a better party but you can't beat using your favorites.
Ampharos provides ambient light for dark places, keep the party healthy with Heal Bell, signal long distances, and act as a generator. Also can mega evolve as my ace, but I'd keep him in his base form most of the time.
Gastrodon can breather underwater to scout undersea locations and carry me across bodies of water. It's resilient to being damaged thanks to it's regenerative abilities, and can also manipulate the earth.
Crobat is a strong flier who can cover long distances and is exceptionally silent while doing so. Useful as a scout and to carry me around. It can also create smokescreens with Haze or confuse enemies to aid in escape.
Absol provides access to fire with Will-O-Wisp or Flamethrower, and is fluffy to snuggle with. It's extrasensory perception of danger would help keep us out of trouble.
Breloom is powerful enough to smash through walls or move heavy objects, can sleep opponents with Spore, and is powerful in battle.
Whimsicott is another warm and fluffy Pokemon to keep warm with, and it's Pokedex entry states that it can fit into tiny spaces, making it ideal for exploration.