Your starter should be strong enough to reach its next stage as you exit Concord Forest.
Lotyx
Grass Overgrow Tulip Fledgling Pokemon Though it sometimes has issues with the long sleeve-like skin on its arms, it can use them to whip up gusts of wind. It likes to perch on high up places to test its balance. Evolves from Tulinewt at level 16
Flarone
Fire/Rock Blaze Live Coal Pokemon It moves around by concentrating the strength of its flames into its two smaller stones and pushing the larger part of its body. Some Flarone have been known to accidentally break in half in anger. Evolves from Firebble at level 15
Cralin
Water/Bug Torrent Feline Crab Pokemon It is constantly rebuilding its shell with rocks, salt, and anything else it might find on the beach. However, since it is constantly being changed, it always has a jagged, irregular shape. Cralin often spin their tails in random patterns so that anything that might sneak up on them might be hit by its hard tail tip. Evolves from Crustox at level 16