Meganium plus T-tar set up to combat sun and rain match-up
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Strategy
Bring Meganium on matchups that favor it such as teams without much poison or steel coverage or those with bulky water-types and even against opposing sand teams, provided that you are able to clear excadrill first. Otherwise when fighting sun teams, bring the sand mode as double rock slide with t-tar and aero can swing momentum in your favor pretty early. Incin and Milo are there to soften the opposing side before bringing in your late game sweeper.
Lead Options
Milo + Incin for neutral matchups, dictate speed control with milo or threaten burn with scald plus intimidate against phys heavy leads. Incin + Aero if tailwind needs to be set up against opposing tailwind setters Aegis + Incin consider this lead when going up against bulky fairy types or trick room setters T-tar + Aero if against sun teams like Char + Aero lead, double rock slide will often win you games quickly considering flinch chances Meganium + Aero/Incin I would only consider this lead if you think Meganium wont be threatened by opposing leads such as if they're leading kang + rotom wash or something, protect + tailwind puts you incredibly ahead with double spread on turn 2
Win Conditions
Clear Meganium weaknesses for endgame sweep Sand set up for Aegis end game sweep (clear threats to aegis for this obviously) You could end in a scenario with a weakened opposition against your healthy Milo + Incin endgame. Just spam scalds/icy winds with protect and you would most likely trade favorably against opposing phys end game
Threats & Bad Matchups
Archaludon Teams are the bane of my existence. Unfortunately, this team lacks in damage necessary to beat a well-positioned Arch. Best you can hope for is enough health to trade with Aegis and that your Meganium has speed control to land weather ball to chunk the bridge. Sableye related above but is a separate issue on its own. Depending on your chosen leads will-o-wisp/screens/encore becomes a huge problem for this team and the fact that sableye is often led with Arch/Sneasler makes clearing it safely with Meganium more difficult. Hard reads is probably required to combat sableye shenanigans. Clearing sableye might be of higher priority than Arch so I would consider saccing Meganium just to get rid of that gremlin. Venusaur matches positively against both of our megas so make sure you have speed control in the endgame preferably with Aero still alive to help deal with Venu Kingambit may pose an issue in the endgame be mindful of icy wind or intimidate against gambito. Safest answer is to whittle down with scald from Milo Rotom Wash is also a threat just by virtue of being able to chunk Milo as well as Will-o-Wisp