Prioritize controlling river terrain and objective sides to limit Skarner's wall-based engage angles and suppression threat.
Use your medium early pressure and strong gank threat with (E) and (R) to contest Scuttles and set up counter-ganks.
This is a control vs teamfight jungle matchup; leverage your objective disruption to deny Skarner's frontline setup and isolate targets.
Jungle Plan
Path toward lanes where your (E) can interrupt Skarner's engage and force his (R) suppression on unfavorable targets.
Contest river control aggressively before dragon and Herald spawns, using (R) to break enemy formations and deny Smite fights.
Counter-jungle only when you have lane priority and vision advantage, avoiding face-checks into Skarner's terrain control zones.
Danger windows
Be cautious around river chokes and wall-heavy terrain where Skarner can land his (E) stun and (R) suppression.
Avoid low-health jungle clears where Skarner can force smite fights or collapse with his gank threat.
Respect Skarner's high invade resistance early; do not overcommit to counter-jungling without lane priority or vision control.
Early game
Start with a three-camp clear focusing on quick access to river Scuttle for early vision and control.
Fight for first Scuttle only if your nearby lanes have priority and can assist in punishing Skarner's approach.
Avoid extended early invades; use (E) to disengage if Skarner attempts to trap you near walls before your cooldowns reset.
Power spikes
At level 6, use (R) to isolate Skarner or peel for your team, forcing him to respect your displacement threat.
After your first AP or tank item, leverage your burst and durability to win short trades and punish Skarner's attempts to duel.
Respect Skarner's tank frontline and suppression utility in mid to late game teamfights; avoid isolated fights where he can pin you with (E) and suppress with (R).
Win conditions
Convert your strong gank threat and objective disruption into early dragon and Herald control to deny Skarner's frontline setups.
Use (R) to break enemy objective formations, isolating Skarner or key targets to enable picks or disengages.
Maintain tempo by tracking Skarner's pathing and counter-ganking his river pressure, forcing him into unfavorable fights and scaling denial.
Tip: For Gragas vs Skarner, read overview, trading pattern, and danger windows first for a fast Jungle lane check.